# 100 leading Architecture and Planning companies in the United States

Tamtam tracks 436 Architecture and Planning companies headquartered in the United States. This list ranks the 100 largest by number of employees on LinkedIn, led by Gensler, HOK and Perkins&Will. Their median headcount is 656. Half of them were founded in 1967 or later. The most common headquarters are New York (9), Chicago (5) and Dallas (4).

The companies listed are large architecture and planning firms operating in the United States. Many of them offer a broad range of services including design, engineering, and urban planning, often with a focus on sustainable solutions. Noteworthy firms include Gensler, a global architecture, design, and planning firm; HOK, offering design, architecture, engineering, and planning services; Perkins&Will, a design and architecture firm; and HKS, Inc., a global architecture and design firm. Most of these companies were founded in the mid-20th century.

A significant pattern observed is the concentration of headquarters in major US cities. For example, New York City is home to HOK, WORKac, Skidmore, Owings & Merrill (SOM), and CannonDesign. Other prominent locations include San Francisco, Chicago, and Dallas. These firms collectively demonstrate a strong emphasis on creating impactful and environmentally conscious designs across various sectors.

🇺🇸 United States · 100 companies · Updated Nov 14, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Gensler](https://www.tamtam.ai/c/gensler) (gensler.com)<br>Global architecture, design, and planning firm with a network of 6,000+ professionals creating positive change through impactful design across various sectors worldwide | Architecture and Planning | 🇺🇸 San Francisco | 8,363 | 1965 |
| 2 | [HOK](https://www.tamtam.ai/c/hok) (hok.com)<br>A global firm offering design, architecture, engineering, and planning services to create sustainable and innovative solutions for clients and communities | Architecture and Planning | 🇺🇸 New York | 3,080 | 1955 |
| 3 | [Perkins&Will](https://www.tamtam.ai/c/perkins-and-will) (perkinswill.com)<br>Design and architecture firm creating healthy, beautiful spaces worldwide with expertise in architecture, interior design, urban and landscape planning. | Architecture and Planning | 🇺🇸 Chicago | 3,060 | 1935 |
| 4 | [HKS, Inc.](https://www.tamtam.ai/c/hks-inc) (hksinc.com)<br>A global architecture and design firm with a focus on sustainability, creativity, and delivering elegant solutions for clients and collaborators | Architecture and Planning | 🇺🇸 Dallas | 2,916 | 1939 |
| 5 | [WORKac](https://www.tamtam.ai/c/workac) (work.ac)<br>Award-winning architecture firm focused on public, cultural, and civic projects worldwide, emphasizing social and environmental concerns through intelligent and playful design | Architecture and Planning | 🇺🇸 New York | 2,654 | 2003 |
| 6 | [Skidmore, Owings & Merrill (SOM)](https://www.tamtam.ai/c/skidmore-owings-and-merrill-som) (som.com)<br>A leading design firm creating environmentally-advanced solutions for a better future, recognized for carbon neutrality and commitment to equality | Architecture and Planning | 🇺🇸 New York | 2,247 | 1936 |
| 7 | [HGA](https://www.tamtam.ai/c/hga) (hga.com)<br>National design firm specializing in architecture and engineering, creating impactful and award-winning designs for healthcare, arts, education, government, science, technology, and energy sectors | Architecture and Planning | 🇺🇸 Minneapolis | 2,141 | 1953 |
| 8 | [DLR Group](https://www.tamtam.ai/c/dlr-group) (dlrgroup.com)<br>Integrated design firm specializing in architecture, engineering, interiors, planning, and building optimization for new construction, renovation, and adaptive reuse with a focus on sustainable design | Architecture and Planning | 🇺🇸 30 Offices | 2,067 | 1966 |
| 9 | [BIG - Bjarke Ingels Group](https://www.tamtam.ai/c/big-bjarke-ingels-group) (big.dk)<br>A global architecture firm based in multiple cities, specializing in innovative and pragmatic urban design, research, and development, with a focus on parental leave support | Architecture and Planning | 🇺🇸 Brooklyn | 1,994 | 2006 |
| 10 | [OLA](https://www.tamtam.ai/c/ola-austin) (olasustainability.com)<br>An Austin-based architecture practice focusing on sustainable design, offering project-specific strategies that integrate clients' design objectives and sustainability goals through a collaborative team approach | Architecture and Planning | 🇺🇸 Austin | 1,933 | 2011 |
| 11 | [SmithGroup](https://www.tamtam.ai/c/smithgroup) (smithgroup.com)<br>Innovative design & engineering firm using research, technology, and design thinking to tackle challenges in architecture, engineering, and environmental science globally | Architecture and Planning | 🇺🇸 Detroit | 1,926 | 1853 |
| 12 | [CannonDesign](https://www.tamtam.ai/c/cannondesign) (cannondesign.com)<br>An integrated design firm leveraging creative thinkers to develop solutions for clients and society, focusing on human flourishing through Living-Centered Design | Architecture and Planning | 🇺🇸 New York | 1,761 | 1945 |
| 13 | [The American Institute of Architects (AIA)](https://www.tamtam.ai/c/the-american-institute-of-architects-aia) (aia.org)<br>An organization supporting architects and allied partners through advocacy, continuing education, contract documents, market research, conferences, awards, and promoting design excellence | Architecture and Planning | 🇺🇸 Washington | 1,757 | 1857 |
| 14 | [TVS](https://www.tamtam.ai/c/tvs) (tvsdesign.com)<br>Award-winning architecture and interior design firm based in Atlanta, with global project expertise across various sectors, delivering creative solutions since 1968 | Architecture and Planning | 🇺🇸 Atlanta | 1,649 | 1968 |
| 15 | [LaBella Associates](https://www.tamtam.ai/c/labella-associates) (labellapc.com)<br>LaBella Associates is a nationally recognized Design Professional Corporation that creates partnerships with clients to deliver exceptional results in buildings, energy, infrastructure, and environmental projects | Architecture and Planning | 🇺🇸 Rochester | 1,613 | 1978 |
| 16 | [FCA](https://www.tamtam.ai/c/fca) (fcarchitects.com)<br>Full-service architectural and design firm creating resonant spaces for clients, incorporating collaboration, enhancing lives, and promoting environmental responsibility through defined, rigorous processes | Architecture and Planning | 🇺🇸 Philadelphia | 1,604 | 1954 |
| 17 | [Corgan](https://www.tamtam.ai/c/corgan) (corgan.com)<br>A leading architecture and design firm, prioritizing client and user needs, specializing in six market sectors with a focus on user-driven design | Architecture and Planning | 🇺🇸 Dallas | 1,564 | 1938 |
| 18 | [KPF](https://www.tamtam.ai/c/kpf) (kpf.com)<br>Architectural practice designing diverse, innovative buildings globally, focusing on quality, contextual sensitivity, and smart solutions without stylistic constraints | Architecture and Planning | 🇺🇸 New York | 1,463 | 1976 |
| 19 | [CMA](https://www.tamtam.ai/c/cma) (core-states.com)<br>The company, now part of Core States Group, offers services related to engineering and architectural design Visit core-statescom for more information | Architecture and Planning | 🇺🇸 Ambler | 1,455 |  |
| 20 | [Page](https://www.tamtam.ai/c/page-washington) (pagethink.com)<br>Multidisciplinary design, architecture, and engineering firm with 1,300+ staff and international offices Specializing in complex projects across various sectors Visit wwwpagethinkcom for more information | Architecture and Planning | 🇺🇸 Washington | 1,448 |  |
| 21 | [PBK](https://www.tamtam.ai/c/pbk) (pbk.com)<br>A leading architecture, engineering, and consulting practice specializing in design solutions for education, healthcare, corporate, government, and sports/events sectors since 1981 | Architecture and Planning | 🇺🇸 Houston | 1,366 |  |
| 22 | [ISG](https://www.tamtam.ai/c/isg-mankato) (isginc.com)<br>A multi-disciplinary firm with over 50 years of experience, owned by employees, serving various markets with collaboration, creativity, and diverse knowledge | Architecture and Planning | 🇺🇸 Mankato | 1,278 | 1973 |
| 23 | [Perkins Eastman](https://www.tamtam.ai/c/perkins-eastman) (perkinseastman.com)<br>Global architecture and design firm focusing on creating a positive impact on people's lives through progressive and inventive design solutions worldwide | Architecture and Planning | 🇺🇸 New York | 1,107 | 1981 |
| 24 | [MIG](https://www.tamtam.ai/c/mig-berkeley) (migcom.com)<br>An organization specializing in planning, design, and sustainability of environments for human development, emphasizing inclusivity, community engagement, and strategic approaches | Architecture and Planning | 🇺🇸 Berkeley | 963 | 1982 |
| 25 | [Independent Architecture](https://www.tamtam.ai/c/independent-architecture) (independentarchitecture.com)<br>Denver-based architecture office blending design with pop culture Specializing in unique projects like small building for Chicago Architecture Biennial and steel barn kit house | Architecture and Planning | 🇺🇸 Denver | 936 | 2009 |
| 26 | [HFA](https://www.tamtam.ai/c/hfa) (hfa-ae.com)<br>A full-service architectural and engineering firm with a diverse team empowering innovative design solutions for a variety of projects Flexible remote work options available | Architecture and Planning | 🇺🇸 Bentonville | 920 | 1990 |
| 27 | [DLZ Corporation](https://www.tamtam.ai/c/dlz-corporation) (dlz.com)<br>A top consulting firm in architecture/engineering, DLZ works on projects nationwide, focusing on client service, innovation, and turning visions into reality | Architecture and Planning | 🇺🇸 Columbus | 911 | 1946 |
| 28 | [CPL](https://www.tamtam.ai/c/cpl-fairport) (cplteam.com)<br>A multi-disciplined team of experts in design and engineering, specializing in projects for community, healthcare, education, and transportation sectors | Architecture and Planning | 🇺🇸 Fairport | 892 | 1975 |
| 29 | [NAC](https://www.tamtam.ai/c/nac-seattle) (nacarchitecture.com)<br>An award-winning design firm with expertise in education, healthcare, senior living, and community recreation, creating innovative spaces that enhance lives | Architecture and Planning | 🇺🇸 Seattle | 888 | 1960 |
| 30 | [Arquitectonica](https://www.tamtam.ai/c/arquitectonica) (arquitectonica.com)<br>A globally renowned architectural firm known for innovative, modern designs, with numerous awards and projects worldwide, pushing the boundaries of design | Architecture and Planning | 🇺🇸 Miami | 875 | 1977 |
| 31 | [ZGF Architects](https://www.tamtam.ai/c/zgf-architects) (zgf.com)<br>ZGF is a design firm rooted in Oregon, focusing on creating sustainable, community-oriented projects across North America with a humanistic approach | Architecture and Planning | 🇺🇸 Portland | 857 | 1942 |
| 32 | [PCA](https://www.tamtam.ai/c/pca) (pcadesign.com)<br>PCA is a prominent design firm in Greater Boston, offering architecture, planning, and interior design services with a focus on innovative and award-winning solutions | Architecture and Planning | 🇺🇸 Cambridge | 852 | 1982 |
| 33 | [VA+](https://www.tamtam.ai/c/va) (vertical-arts.com)<br>A Denver-based team of BIM professionals collaborates with architects and engineers globally to enhance BIM workflows and outcomes for successful design projects | Architecture and Planning | 🇺🇸 Denver | 847 | 2005 |
| 34 | [NBBJ Design](https://www.tamtam.ai/c/nbbj-design) (nbbj.com)<br>An innovative architecture and design firm creating dynamic environments for industry leaders and institutions worldwide, with a focus on community connectivity and sustainability | Architecture and Planning | 🇺🇸 Seattle | 841 | 1943 |
| 35 | [JERDE](https://www.tamtam.ai/c/jerde) (jerde.com)<br>This global design group specializes in innovative urban planning, architecture, and landscaping to create unique, experiential places around the world | Architecture and Planning | 🇺🇸 Los Angeles | 795 | 1977 |
| 36 | [PAE](https://www.tamtam.ai/c/pae-portland) (pae-engineers.com)<br>An engineering firm specializing in mechanical, electrical, and technology system design, with a focus on sustainability, regenerative engineering, and community impact | Architecture and Planning | 🇺🇸 Portland | 783 | 1967 |
| 37 | [SMMA](https://www.tamtam.ai/c/smma) (smma.com)<br>A multidisciplinary design firm balancing architecture, engineering, interiors, and site design to provide creative and technical expertise since 1955 | Architecture and Planning | 🇺🇸 Cambridge | 766 | 1955 |
| 38 | [OHM Advisors](https://www.tamtam.ai/c/ohm-advisors) (ohm-advisors.com)<br>AEP firm specializing in community advancement through multidisciplinary teamwork in architecture, engineering, and planning Award-winning work creating great places | Architecture and Planning | 🇺🇸 Livonia | 754 | 1962 |
| 39 | [Ghafari Associates](https://www.tamtam.ai/c/ghafari-associates) (ghafari.com)<br>Since 1982, this company offers integrated design solutions for various sectors globally, with services in architecture, engineering, and operations | Architecture and Planning | 🇺🇸 Dearborn | 741 | 1982 |
| 40 | [LPA, Inc.](https://www.tamtam.ai/c/lpa-inc) (lpadesignstudios.com)<br>LPA is a design firm focused on creating timeless, sustainable projects that benefit the environment, enrich human experiences, and inspire innovation | Architecture and Planning | 🇺🇸 Irvine | 731 | 1965 |
| 41 | [Shive-Hattery](https://www.tamtam.ai/c/shive-hattery) (shive-hattery.com)<br>This architecture and engineering consulting firm delivers customized solutions, builds relationships, and aims to be a trusted advisor to clients | Architecture and Planning | 🇺🇸 Cedar Rapids | 705 | 1895 |
| 42 | [American Institute of Architecture Students (AIAS)](https://www.tamtam.ai/c/american-institute-of-architecture-students-aias) (aias.org)<br>A student-run, non-profit organization providing a community and forum for architecture students to support each other and advocate for their profession | Architecture and Planning | 🇺🇸 Washington | 700 | 1956 |
| 43 | [Unispace](https://www.tamtam.ai/c/unispace) (unispace.com)<br>It is a global leader in workplace strategy, design, and construction, creating spaces that enhance connections and foster success. | Architecture and Planning | 🇺🇸 Unispace Global | 693 | 2010 |
| 44 | [Hacker](https://www.tamtam.ai/c/hacker) (hackerarchitects.com)<br>A studio of architects creating spaces that connect us to the landscape, each other, and ourselves with honesty, sustainability, and beauty | Architecture and Planning | 🇺🇸 Portland | 689 | 1983 |
| 45 | [HLW](https://www.tamtam.ai/c/hlw) (hlw.com)<br>Leading international firm providing full-service planning, architecture, and design for innovative companies across various sectors, with a mission to question norms and build the future | Architecture and Planning | 🇺🇸 New York | 686 | 1885 |
| 46 | [H2M architects + engineers](https://www.tamtam.ai/c/h2m-architects-engineers) (h2m.com)<br>A multi-disciplinary consulting and design firm providing architecture, engineering, environmental services, and more with offices in New York and New Jersey | Architecture and Planning | 🇺🇸 Melville | 686 | 1933 |
| 47 | [Harvard University Graduate School of Design](https://www.tamtam.ai/c/harvard-university-graduate-school-of-design) (gsd.harvard.edu)<br>A leading graduate school focused on educating professionals in architecture, landscape design, urban planning, and related disciplines to shape the 21st century built environment | Architecture and Planning | 🇺🇸 Cambridge | 681 |  |
| 48 | [Parkhill](https://www.tamtam.ai/c/parkhill) (parkhill.com)<br>Established in 1945, this multidisciplinary firm offers architecture and engineering design services for various projects in government, commercial, and institutional sectors across multiple states | Architecture and Planning | 🇺🇸 Lubbock | 674 | 1945 |
| 49 | [SCB](https://www.tamtam.ai/c/scb) (scb.com)<br>A leading architecture firm offering design services for urban living, workplaces, learning environments, infrastructure, and communities with a century-long legacy | Architecture and Planning | 🇺🇸 Chicago | 659 | 1931 |
| 50 | [WATG and Wimberly Interiors](https://www.tamtam.ai/c/watg-and-wimberly-interiors) (watg.com)<br>A top provider of integrated luxury hospitality design services, offering advisory, master planning, architecture, landscape design, and Wimberly Interiors | Architecture and Planning | 🇺🇸 Tustin | 656 | 1945 |
| 51 | [Cheese Cake Factory](https://www.tamtam.ai/c/cheese-cake-factory)<br>An architecture and planning firm located in Westbury, New York, specializing in creating innovative designs for various projects | Architecture and Planning | 🇺🇸 Westbury | 654 |  |
| 52 | [LEO A DALY](https://www.tamtam.ai/c/leo-a-daly) (leoadaly.com)<br>Leading architecture, engineering, planning, and interior design firm with a rich history of excellence, creating exceptional spaces globally since 1915 | Architecture and Planning | 🇺🇸 Omaha | 639 | 1915 |
| 53 | [RSP Architects](https://www.tamtam.ai/c/rsp-architects) (rsparch.com)<br>This company is a team of designers and architects who provide a wide range of services to clients in various industries globally | Architecture and Planning | 🇺🇸 Minneapolis | 633 | 1978 |
| 54 | [Cushing Terrell](https://www.tamtam.ai/c/cushing-terrell) (cushingterrell.com)<br>A multidisciplinary design firm offering architecture, engineering, and design services to create sustainable, innovative spaces for various projects nationwide | Architecture and Planning | 🇺🇸 Billings | 605 | 1938 |
| 55 | [SWA](https://www.tamtam.ai/c/swa) (swagroup.com)<br>Collective of eight independent studios specializing in landscape architecture, urban design, and planning with employee ownership structure. | Architecture and Planning | 🇺🇸 Sausalito | 603 |  |
| 56 | [HMC Architects](https://www.tamtam.ai/c/hmc-architects) (hmcarchitects.com)<br>Employee-owned design firm established in 1940, focusing on creating impactful healthcare, education, and civic spaces in California through innovative designs | Architecture and Planning | 🇺🇸 Los Angeles | 587 | 1940 |
| 57 | [Sasaki](https://www.tamtam.ai/c/sasaki) (sasaki.com)<br>Multidisciplinary firm combining architecture, interior design, landscape architecture, urban planning, engineering, branding, and data science to shape human-centered spaces. | Architecture and Planning | 🇺🇸 Boston | 579 | 1953 |
| 58 | [DAVIS](https://www.tamtam.ai/c/davis) (thedavisexperience.com)<br>Specializing in Architecture, Interiors, and Urban Design, creating exceptional commercial and residential mixed-use properties to enhance quality of life in places people live, work, and gather | Architecture and Planning | 🇺🇸 Phoenix | 567 | 1991 |
| 59 | [Coast 2 Coast](https://www.tamtam.ai/c/coast-2-coast) (coast2coast.net)<br>Specializing in architectural documentation, we support architects, engineers, and property owners with 3D models, 2D plans, and 360 photography for commercial renovation and construction projects | Architecture and Planning | 🇺🇸 Chattanooga | 564 | 2000 |
| 60 | [Walker Consultants](https://www.tamtam.ai/c/walker-consultants) (walkerconsultants.com)<br>Planning, design, engineering, forensics, restoration, and consulting services for built environments, specializing in parking, mobility, and building envelope solutions. | Architecture and Planning | 🇺🇸 Hoffman Estates | 550 | 1965 |
| 61 | [AAI](https://www.tamtam.ai/c/aai) (nelsonworldwide.com)<br>A full-service architecture, design, engineering, and consulting firm with a focus on corporate interior design and serving Bay Area technology clients | Architecture and Planning | 🇺🇸 San Jose | 550 | 1979 |
| 62 | [JMA](https://www.tamtam.ai/c/jma) (jmaarch.com)<br>A design firm specializing in Hospitality, Commercial, Healthcare, and Public projects, emphasizing design excellence, creativity, and technical skills for success | Architecture and Planning | 🇺🇸 Las Vegas | 546 | 1945 |
| 63 | [LS3P ASSOCIATES LTD.](https://www.tamtam.ai/c/ls3p-associates-ltd) (ls3p.com)<br>An architecture, interiors, and planning firm with 60 years of design excellence, focusing on creating outstanding spaces for various purposes | Architecture and Planning | 🇺🇸 Charleston | 543 | 1963 |
| 64 | [GFF Design](https://www.tamtam.ai/c/gff-design) (gff.com)<br>A Dallas-based design firm offering architecture, interiors, planning, and landscape design services for corporate, real estate, and institutional clients nationally and internationally | Architecture and Planning | 🇺🇸 Dallas | 539 | 1982 |
| 65 | [MG2 Design](https://www.tamtam.ai/c/mg2-design) (mg2.com)<br>Global architecture, design, construction, and branding studio creating innovative community environments, consumer experiences, and client programs while promoting social responsibility | Architecture and Planning | 🇺🇸 Seattle | 538 | 1971 |
| 66 | [KTGY](https://www.tamtam.ai/c/ktgy) (ktgy.com)<br>Award-winning design firm specializing in architecture, branding, interiors, and planning, dedicated to innovation, creativity, and making a positive impact on communities | Architecture and Planning | 🇺🇸 Irvine | 528 |  |
| 67 | [Design Workshop](https://www.tamtam.ai/c/design-workshop) (designworkshop.com)<br>A global design studio specializing in landscape architecture, urban design, planning, and environmental graphic design, committed to sustainability and community connections | Architecture and Planning | 🇺🇸 Denver | 520 | 1969 |
| 68 | [EwingCole](https://www.tamtam.ai/c/ewingcole) (ewingcole.com)<br>A nationally recognized architecture, engineering, interior design, and planning firm with a focus on professional excellence, design quality, collaboration, and client advocacy | Architecture and Planning | 🇺🇸 Philadelphia | 491 | 1961 |
| 69 | [McMillan Pazdan Smith Architecture](https://www.tamtam.ai/c/mcmillan-pazdan-smith-architecture) (mcmillanpazdansmith.com)<br>Architecture, advisory services, planning, and interior design firm in the Southeast with a focus on collaboration, innovation, and meaningful impact | Architecture and Planning | 🇺🇸 Greenville | 489 | 1955 |
| 70 | [Wright Patterson Air Force](https://www.tamtam.ai/c/wright-patterson-air-force)<br>An architecture and planning company located in Wright-Patterson Air Force Base, Ohio, specializing in designing and developing structures and urban layouts | Architecture and Planning | 🇺🇸 Wright Ptrsn Afb | 466 |  |
| 71 | [Rockwell Group](https://www.tamtam.ai/c/rockwell-group) (rockwellgroup.com)<br>Innovative interdisciplinary architecture and design firm based in New York, creating extraordinary experiences and environments worldwide through merging performance and architecture | Architecture and Planning | 🇺🇸 New York | 459 | 1984 |
| 72 | [AO](https://www.tamtam.ai/c/ao) (aoarchitects.com)<br>Architectural firm established in 1974 specializing in Retail, Residential, and Mixed-Use projects with 50 years of experience and industry leadership | Architecture and Planning | 🇺🇸 Orange | 452 | 1974 |
| 73 | [GOA](https://www.tamtam.ai/c/goa) (goaarchitecture.com)<br>We are an architecture firm that integrates design and building production with a focus on sustainability, innovative technologies, and community-centric spaces | Architecture and Planning | 🇺🇸 New Haven | 450 | 1998 |
| 74 | [Studio Gang](https://www.tamtam.ai/c/studio-gang) (studiogang.com)<br>An architecture and urban design firm based in Chicago with offices in NY, SF, and Paris, focusing on innovative projects across various scales | Architecture and Planning | 🇺🇸 Chicago | 449 | 1997 |
| 75 | [EUA](https://www.tamtam.ai/c/eua) (eua.com)<br>A leading architecture and design firm with 116 years of experience, offering solutions in education, workplace, healthcare, and more nationwide | Architecture and Planning | 🇺🇸 Milwaukee | 446 | 1907 |
| 76 | [LASD Studio](https://www.tamtam.ai/c/lasd-studio) (lasdstudio.com)<br>Global provider of landscape design, exterior design, landscape architecture, and urban design services in San Diego, New York, and Madrid | Architecture and Planning | 🇺🇸 La Jolla | 438 | 2008 |
| 77 | [Clark Nexsen, A JMT Company](https://www.tamtam.ai/c/clark-nexsen-a-jmt-company) (clarknexsen.com)<br>An integrated architecture and engineering firm creating innovative design solutions for a variety of markets globally, ranked among the top firms in multiple sectors | Architecture and Planning | 🇺🇸 Virginia Beach | 434 | 1920 |
| 78 | [MAD](https://www.tamtam.ai/c/mad-santa-monica) (i-mad.com)<br>MAD creates futuristic architecture inspired by the eastern spirit of nature, focusing on community, freedom, and personalized experiences in various projects | Architecture and Planning | 🇺🇸 Santa Monica | 433 | 2004 |
| 79 | [Progressive Companies](https://www.tamtam.ai/c/progressive-companies) (weareprogressive.com)<br>National architecture, engineering, and consulting firm delivering strategic results by balancing human experience, business process, infrastructure, and financial performance. | Architecture and Planning | 🇺🇸 Grand Rapids | 429 | 1962 |
| 80 | [Lerch Bates Inc.](https://www.tamtam.ai/c/lerch-bates-inc) (lerchbates.com)<br>Global technical consultancy specializing in building design, modernization, investigation, and management, offering services for vertical transportation, logistics, enclosures, facades, and building lifecycle optimization | Architecture and Planning | 🇺🇸 Highlands Ranch | 426 |  |
| 81 | [Blue Heron](https://www.tamtam.ai/c/blue-heron) (blueheron.com)<br>Blue Heron is a design-led development firm known for reinventing home architecture in Las Vegas with modern design, technology, and biophilic elements | Architecture and Planning | 🇺🇸 Las Vegas | 422 | 2004 |
| 82 | [Mithun](https://www.tamtam.ai/c/mithun) (mithun.com)<br>An integrated design firm committed to creating positive change through architecture, landscape, interior design, and urban planning with a focus on sustainability and social equity | Architecture and Planning | 🇺🇸 Seattle | 420 | 1949 |
| 83 | [HCM](https://www.tamtam.ai/c/hcm) (hcmdesign.com)<br>An integrated firm offering planning, architecture, landscape architecture, interior design, and environmental graphic design, focusing on creating functional, inspiring, and environmentally responsible spaces | Architecture and Planning | 🇺🇸 Baltimore | 419 | 1977 |
| 84 | [Archinect](https://www.tamtam.ai/c/archinect) (archinect.com)<br>Established in 1997, this online architecture community and content source provides job listings, news, events, discussions, and profiles for architects and students | Architecture and Planning | 🇺🇸 Los Angeles | 418 | 1997 |
| 85 | [STUDIOS Architecture](https://www.tamtam.ai/c/studios-architecture) (studios.com)<br>An international design practice with studios in multiple cities, specializing in creating built environments that reflect clients' organizations with collaboration and expertise | Architecture and Planning | 🇺🇸 San Francisco | 417 | 1985 |
| 86 | [FGM Architects](https://www.tamtam.ai/c/fgm-architects) (fgmarchitects.com)<br>Specializing in planning and designing various environments, from residential to educational to commercial spaces, with a focus on client service and community engagement | Architecture and Planning | 🇺🇸 Westchester | 407 | 1945 |
| 87 | [Design Plus](https://www.tamtam.ai/c/design-plus) (design-plus.com)<br>Medium-sized, full-service A/E and Design firm specializing in Architectural, Interior, Engineering, Planning, and Landscape services with a focus on creative problem-solving and client service | Architecture and Planning | 🇺🇸 Grand Rapids | 388 | 1979 |
| 88 | [Flad Architects](https://www.tamtam.ai/c/flad-architects) (flad.com)<br>A global leader in innovative design solutions for healthcare, higher education, and science and technology clients, empowering knowledge-based organizations to excel | Architecture and Planning | 🇺🇸 Madison | 384 | 1927 |
| 89 | [BRR Architecture](https://www.tamtam.ai/c/brr-architecture) (brrarch.com)<br>A design firm with team-based approach, partnering with clients nationwide, treating projects as their own, and overcoming challenges with a straightforward process | Architecture and Planning | 🇺🇸 Overland Park | 379 | 1963 |
| 90 | [Galloway & Company, LLC](https://www.tamtam.ai/c/galloway-and-company-llc) (gallowayus.com)<br>A multidisciplinary firm in architecture, engineering, and survey services, providing full support for development projects with a collaborative, client-focused approach | Architecture and Planning | 🇺🇸 Greenwood Village | 378 | 1982 |
| 91 | [Grace Design Studios](https://www.tamtam.ai/c/grace-design-studios) (grace-design.com)<br>Grace Hebert Curtis is a design firm with over 50 years of experience, providing innovative solutions and building long-term client relationships | Architecture and Planning | 🇺🇸 Nashville | 366 | 1967 |
| 92 | [LJC](https://www.tamtam.ai/c/ljc) (theljc.com)<br>"Integrated architecture and design firm offering services in architecture, interior design, urban planning, and landscape architecture with a focus on collaboration and quality assurance" | Architecture and Planning | 🇺🇸 Chicago | 361 | 1999 |
| 93 | [WENDEL Companies](https://www.tamtam.ai/c/wendel-companies) (wendelcompanies.com)<br>A multi-disciplinary firm offering architecture, engineering, energy efficiency, and construction management services with a focus on delivering innovative solutions nationwide | Architecture and Planning | 🇺🇸 Williamsville | 361 | 1940 |
| 94 | [MAPS](https://www.tamtam.ai/c/maps) (map-strategies.com)<br>MAPS® is dedicated to providing regulatory guidance and project management for real estate, architecture, and construction to improve outcomes and reduce costs | Architecture and Planning | 🇺🇸 Chicago | 359 | 2014 |
| 95 | [STRAND](https://www.tamtam.ai/c/strand) (strandae.com)<br>Architecture and design firm based in Dallas, Texas, offering services worldwide Specializing in diverse projects, client-focused solutions, and sustainable design | Architecture and Planning | 🇺🇸 Dallas | 358 | 1979 |
| 96 | [GreenbergFarrow (GF)](https://www.tamtam.ai/c/greenbergfarrow-gf) (greenbergfarrow.com)<br>A fully integrated firm offering architecture, engineering, planning, interior design, landscape architecture, and land development services with 50 years of experience | Architecture and Planning | 🇺🇸 Atlanta | 356 | 1974 |
| 97 | [RAMSA \| Robert A.M. Stern Architects](https://www.tamtam.ai/c/ramsa-robert-a-m-stern-architects) (ramsa.com)<br>Global architecture specializing in residential, academic, and cultural buildings in New York City Dedicated to research-driven practices and preserving a sense of place | Architecture and Planning | 🇺🇸 New York | 356 | 1969 |
| 98 | [RTKL](https://www.tamtam.ai/c/rtkl) (callisonrtkl.com)<br>A global leader in sustainable design and engineering solutions for natural and built assets, addressing complex urban challenges and shaping future cities | Architecture and Planning | 🇺🇸 Washington | 355 | 1946 |
| 99 | [Excel Engineering, Inc.](https://www.tamtam.ai/c/excel-engineering-inc) (excelengineer.com)<br>National full-service architectural and engineering firm offering design, engineering, and scanning services for various markets, focused on customer-centered teamwork and exceeding client expectations | Architecture and Planning | 🇺🇸 Fond du Lac | 354 | 1991 |
| 100 | [Huckabee \| a MOREgroup brand](https://www.tamtam.ai/c/huckabee-a-moregroup-brand) (moregroup-inc.com)<br>A leading educational architecture firm specializing in creating inspiring, safe, and engaging spaces for learners of all ages to expand their knowledge | Architecture and Planning | 🇺🇸 Fort Worth | 353 | 1967 |

## How this list is built

Every company on this list has a Tamtam company profile. The industry is the one the company gives on LinkedIn; categories such as SaaS or fintech are classified by Tamtam's AI from the company's website and LinkedIn page; and the headquarters city must match the company's own address. Companies are ranked by the number of employees on LinkedIn, and the list is refreshed every night. Classifications can be wrong, so treat the list as a starting point rather than an official ranking. Last updated Nov 14, 2026.

## More company lists in the United States

- [The largest companies in the United States](https://www.tamtam.ai/l/largest-companies-united-states) (104,979)
- [Multinational companies in the United States](https://www.tamtam.ai/l/multinational-companies-united-states) (16,191)
- [Manufacturers in the United States](https://www.tamtam.ai/l/manufacturers-united-states) (8,677)
- [Professional services firms in the United States](https://www.tamtam.ai/l/professional-services-firms-united-states) (7,080)
- [Retail chains in the United States](https://www.tamtam.ai/l/retail-chains-united-states) (6,981)
- [Financial services firms in the United States](https://www.tamtam.ai/l/financial-services-firms-united-states) (6,867)
- [Companies with in-house R&D in the United States](https://www.tamtam.ai/l/r-and-d-companies-united-states) (6,794)
- [IT Services and IT Consulting companies in the United States](https://www.tamtam.ai/l/it-services-and-it-consulting-companies-united-states) (6,695)
- [SaaS companies in the United States](https://www.tamtam.ai/l/saas-companies-united-states) (6,410)
- [IT services companies in the United States](https://www.tamtam.ai/l/it-services-companies-united-states) (5,818)
- [Healthcare providers in the United States](https://www.tamtam.ai/l/healthcare-providers-united-states) (5,810)
- [Critical infrastructure operators in the United States](https://www.tamtam.ai/l/critical-infrastructure-operators-united-states) (5,801)
- [Hospitals and Health Care companies in the United States](https://www.tamtam.ai/l/hospitals-and-health-care-companies-united-states) (5,573)
- [Hardware manufacturers in the United States](https://www.tamtam.ai/l/hardware-companies-united-states) (5,344)
- [Software Development companies in the United States](https://www.tamtam.ai/l/software-development-companies-united-states) (5,311)
- [Financial Services companies in the United States](https://www.tamtam.ai/l/financial-services-companies-united-states) (5,014)
- [Companies with a mobile app in the United States](https://www.tamtam.ai/l/companies-with-mobile-app-united-states) (4,663)
- [Consulting firms in the United States](https://www.tamtam.ai/l/consulting-firms-united-states) (4,383)
- [AI companies in the United States](https://www.tamtam.ai/l/ai-companies-united-states) (4,246)
- [Public sector organisations in the United States](https://www.tamtam.ai/l/public-sector-organisations-united-states) (4,151)
- [Subscription businesses in the United States](https://www.tamtam.ai/l/subscription-businesses-united-states) (3,923)
- [Real Estate companies in the United States](https://www.tamtam.ai/l/real-estate-companies-united-states) (3,808)
- [Higher Education companies in the United States](https://www.tamtam.ai/l/higher-education-companies-united-states) (3,470)
- [Construction companies in the United States](https://www.tamtam.ai/l/construction-companies-united-states) (3,271)

## The same list elsewhere in United States

- [Architecture and Planning companies in New York State](https://www.tamtam.ai/l/architecture-and-planning-companies-new-york-state) (75)
- [Architecture and Planning companies in California](https://www.tamtam.ai/l/architecture-and-planning-companies-california) (58)
- [Architecture and Planning companies in Texas](https://www.tamtam.ai/l/architecture-and-planning-companies-texas) (28)
- [Architecture and Planning companies in New York](https://www.tamtam.ai/l/architecture-and-planning-companies-new-york) (55)

## The same list elsewhere

- [Architecture and Planning companies in the world](https://www.tamtam.ai/l/architecture-and-planning-companies-in-the-world) (1,381)

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Source: https://www.tamtam.ai/l/architecture-and-planning-companies-united-states