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.
| # | Company | Employees | |||
|---|---|---|---|---|---|
| 1 |
Genslergensler.com
Global architecture, design, and planning firm with a network of 6,000+ professionals creating positive change through impactful design across various sectors worldwide |
8,363 | |||
| 2 | 3,080 | ||||
| 3 |
Perkins&Willperkinswill.com
Design and architecture firm creating healthy, beautiful spaces worldwide with expertise in architecture, interior design, urban and landscape planning. |
3,060 | |||
| 4 |
HKS, Inc.hksinc.com
A global architecture and design firm with a focus on sustainability, creativity, and delivering elegant solutions for clients and collaborators |
2,916 | |||
| 5 | 2,654 | ||||
| 6 |
Skidmore, Owings & Merrill (SOM)som.com
A leading design firm creating environmentally-advanced solutions for a better future, recognized for carbon neutrality and commitment to equality |
2,247 | |||
| 7 | 2,141 | ||||
| 8 |
DLR Groupdlrgroup.com
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 |
2,067 | |||
| 9 |
BIG - Bjarke Ingels Groupbig.dk
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 |
1,994 | |||
| 10 |
OLAolasustainability.com
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 |
1,933 | |||
| 11 |
SmithGroupsmithgroup.com
Innovative design & engineering firm using research, technology, and design thinking to tackle challenges in architecture, engineering, and environmental science globally |
1,926 | |||
| 12 |
CannonDesigncannondesign.com
An integrated design firm leveraging creative thinkers to develop solutions for clients and society, focusing on human flourishing through Living-Centered Design |
1,761 | |||
| 13 |
The American Institute of Architects (AIA)aia.org
An organization supporting architects and allied partners through advocacy, continuing education, contract documents, market research, conferences, awards, and promoting design excellence |
1,757 | |||
| 14 |
TVStvsdesign.com
Award-winning architecture and interior design firm based in Atlanta, with global project expertise across various sectors, delivering creative solutions since 1968 |
1,649 | |||
| 15 |
LaBella Associateslabellapc.com
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 |
1,613 | |||
| 16 |
FCAfcarchitects.com
Full-service architectural and design firm creating resonant spaces for clients, incorporating collaboration, enhancing lives, and promoting environmental responsibility through defined, rigorous processes |
1,604 | |||
| 17 |
Corgancorgan.com
A leading architecture and design firm, prioritizing client and user needs, specializing in six market sectors with a focus on user-driven design |
1,564 | |||
| 18 | 1,463 | ||||
| 19 |
CMAcore-states.com
The company, now part of Core States Group, offers services related to engineering and architectural design Visit core-statescom for more information |
1,455 | |||
| 20 |
Pagepagethink.com
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 |
1,448 | |||
| 21 | 1,366 | ||||
| 22 |
ISGisginc.com
A multi-disciplinary firm with over 50 years of experience, owned by employees, serving various markets with collaboration, creativity, and diverse knowledge |
1,278 | |||
| 23 |
Perkins Eastmanperkinseastman.com
Global architecture and design firm focusing on creating a positive impact on people's lives through progressive and inventive design solutions worldwide |
1,107 | |||
| 24 |
MIGmigcom.com
An organization specializing in planning, design, and sustainability of environments for human development, emphasizing inclusivity, community engagement, and strategic approaches |
963 | |||
| 25 |
Independent Architectureindependentarchitecture.com
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 |
936 | |||
| 26 |
HFAhfa-ae.com
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 |
920 | |||
| 27 |
DLZ Corporationdlz.com
A top consulting firm in architecture/engineering, DLZ works on projects nationwide, focusing on client service, innovation, and turning visions into reality |
911 | |||
| 28 |
CPLcplteam.com
A multi-disciplined team of experts in design and engineering, specializing in projects for community, healthcare, education, and transportation sectors |
892 | |||
| 29 |
NACnacarchitecture.com
An award-winning design firm with expertise in education, healthcare, senior living, and community recreation, creating innovative spaces that enhance lives |
888 | |||
| 30 |
Arquitectonicaarquitectonica.com
A globally renowned architectural firm known for innovative, modern designs, with numerous awards and projects worldwide, pushing the boundaries of design |
875 | |||
| 31 |
ZGF Architectszgf.com
ZGF is a design firm rooted in Oregon, focusing on creating sustainable, community-oriented projects across North America with a humanistic approach |
857 | |||
| 32 |
PCApcadesign.com
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 |
852 | |||
| 33 |
VA+vertical-arts.com
A Denver-based team of BIM professionals collaborates with architects and engineers globally to enhance BIM workflows and outcomes for successful design projects |
847 | |||
| 34 |
NBBJ Designnbbj.com
An innovative architecture and design firm creating dynamic environments for industry leaders and institutions worldwide, with a focus on community connectivity and sustainability |
841 | |||
| 35 | 795 | ||||
| 36 |
PAEpae-engineers.com
An engineering firm specializing in mechanical, electrical, and technology system design, with a focus on sustainability, regenerative engineering, and community impact |
783 | |||
| 37 | 766 | ||||
| 38 |
OHM Advisorsohm-advisors.com
AEP firm specializing in community advancement through multidisciplinary teamwork in architecture, engineering, and planning Award-winning work creating great places |
754 | |||
| 39 |
Ghafari Associatesghafari.com
Since 1982, this company offers integrated design solutions for various sectors globally, with services in architecture, engineering, and operations |
741 | |||
| 40 |
LPA, Inc.lpadesignstudios.com
LPA is a design firm focused on creating timeless, sustainable projects that benefit the environment, enrich human experiences, and inspire innovation |
731 | |||
| 41 |
Shive-Hatteryshive-hattery.com
This architecture and engineering consulting firm delivers customized solutions, builds relationships, and aims to be a trusted advisor to clients |
705 | |||
| 42 |
American Institute of Architecture Students (AIAS)aias.org
A student-run, non-profit organization providing a community and forum for architecture students to support each other and advocate for their profession |
700 | |||
| 43 |
Unispaceunispace.com
It is a global leader in workplace strategy, design, and construction, creating spaces that enhance connections and foster success. |
693 | |||
| 44 |
Hackerhackerarchitects.com
A studio of architects creating spaces that connect us to the landscape, each other, and ourselves with honesty, sustainability, and beauty |
689 | |||
| 45 | 686 | ||||
| 46 |
H2M architects + engineersh2m.com
A multi-disciplinary consulting and design firm providing architecture, engineering, environmental services, and more with offices in New York and New Jersey |
686 | |||
| 47 |
Harvard University Graduate School of Designgsd.harvard.edu
A leading graduate school focused on educating professionals in architecture, landscape design, urban planning, and related disciplines to shape the 21st century built environment |
681 | |||
| 48 |
Parkhillparkhill.com
Established in 1945, this multidisciplinary firm offers architecture and engineering design services for various projects in government, commercial, and institutional sectors across multiple states |
674 | |||
| 49 | 659 | ||||
| 50 |
WATG and Wimberly Interiorswatg.com
A top provider of integrated luxury hospitality design services, offering advisory, master planning, architecture, landscape design, and Wimberly Interiors |
656 | |||
Want more companies than this list?This page shows the largest ones only. Connect to Tamtam to see every company that matches, filter by size, industry or growth, and reach their decision-makers. | |||||
| 51 |
Cheese Cake Factory
An architecture and planning firm located in Westbury, New York, specializing in creating innovative designs for various projects |
654 | |||
| 52 |
LEO A DALYleoadaly.com
Leading architecture, engineering, planning, and interior design firm with a rich history of excellence, creating exceptional spaces globally since 1915 |
639 | |||
| 53 |
RSP Architectsrsparch.com
This company is a team of designers and architects who provide a wide range of services to clients in various industries globally |
633 | |||
| 54 |
Cushing Terrellcushingterrell.com
A multidisciplinary design firm offering architecture, engineering, and design services to create sustainable, innovative spaces for various projects nationwide |
605 | |||
| 55 |
SWAswagroup.com
Collective of eight independent studios specializing in landscape architecture, urban design, and planning with employee ownership structure. |
603 | |||
| 56 |
HMC Architectshmcarchitects.com
Employee-owned design firm established in 1940, focusing on creating impactful healthcare, education, and civic spaces in California through innovative designs |
587 | |||
| 57 |
Sasakisasaki.com
Multidisciplinary firm combining architecture, interior design, landscape architecture, urban planning, engineering, branding, and data science to shape human-centered spaces. |
579 | |||
| 58 |
DAVISthedavisexperience.com
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 |
567 | |||
| 59 |
Coast 2 Coastcoast2coast.net
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 |
564 | |||
| 60 |
Walker Consultantswalkerconsultants.com
Planning, design, engineering, forensics, restoration, and consulting services for built environments, specializing in parking, mobility, and building envelope solutions. |
550 | |||
| 61 |
AAInelsonworldwide.com
A full-service architecture, design, engineering, and consulting firm with a focus on corporate interior design and serving Bay Area technology clients |
550 | |||
| 62 |
JMAjmaarch.com
A design firm specializing in Hospitality, Commercial, Healthcare, and Public projects, emphasizing design excellence, creativity, and technical skills for success |
546 | |||
| 63 |
LS3P ASSOCIATES LTD.ls3p.com
An architecture, interiors, and planning firm with 60 years of design excellence, focusing on creating outstanding spaces for various purposes |
543 | |||
| 64 |
GFF Designgff.com
A Dallas-based design firm offering architecture, interiors, planning, and landscape design services for corporate, real estate, and institutional clients nationally and internationally |
539 | |||
| 65 |
MG2 Designmg2.com
Global architecture, design, construction, and branding studio creating innovative community environments, consumer experiences, and client programs while promoting social responsibility |
538 | |||
| 66 | 528 | ||||
| 67 |
Design Workshopdesignworkshop.com
A global design studio specializing in landscape architecture, urban design, planning, and environmental graphic design, committed to sustainability and community connections |
520 | |||
| 68 |
EwingColeewingcole.com
A nationally recognized architecture, engineering, interior design, and planning firm with a focus on professional excellence, design quality, collaboration, and client advocacy |
491 | |||
| 69 |
McMillan Pazdan Smith Architecturemcmillanpazdansmith.com
Architecture, advisory services, planning, and interior design firm in the Southeast with a focus on collaboration, innovation, and meaningful impact |
489 | |||
| 70 |
Wright Patterson Air Force
An architecture and planning company located in Wright-Patterson Air Force Base, Ohio, specializing in designing and developing structures and urban layouts |
466 | |||
| 71 |
Rockwell Grouprockwellgroup.com
Innovative interdisciplinary architecture and design firm based in New York, creating extraordinary experiences and environments worldwide through merging performance and architecture |
459 | |||
| 72 |
AOaoarchitects.com
Architectural firm established in 1974 specializing in Retail, Residential, and Mixed-Use projects with 50 years of experience and industry leadership |
452 | |||
| 73 |
GOAgoaarchitecture.com
We are an architecture firm that integrates design and building production with a focus on sustainability, innovative technologies, and community-centric spaces |
450 | |||
| 74 |
Studio Gangstudiogang.com
An architecture and urban design firm based in Chicago with offices in NY, SF, and Paris, focusing on innovative projects across various scales |
449 | |||
| 75 | 446 | ||||
| 76 |
LASD Studiolasdstudio.com
Global provider of landscape design, exterior design, landscape architecture, and urban design services in San Diego, New York, and Madrid |
438 | |||
| 77 |
Clark Nexsen, A JMT Companyclarknexsen.com
An integrated architecture and engineering firm creating innovative design solutions for a variety of markets globally, ranked among the top firms in multiple sectors |
434 | |||
| 78 | 433 | ||||
| 79 |
Progressive Companiesweareprogressive.com
National architecture, engineering, and consulting firm delivering strategic results by balancing human experience, business process, infrastructure, and financial performance. |
429 | |||
| 80 |
Lerch Bates Inc.lerchbates.com
Global technical consultancy specializing in building design, modernization, investigation, and management, offering services for vertical transportation, logistics, enclosures, facades, and building lifecycle optimization |
426 | |||
| 81 |
Blue Heronblueheron.com
Blue Heron is a design-led development firm known for reinventing home architecture in Las Vegas with modern design, technology, and biophilic elements |
422 | |||
| 82 |
Mithunmithun.com
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 |
420 | |||
| 83 |
HCMhcmdesign.com
An integrated firm offering planning, architecture, landscape architecture, interior design, and environmental graphic design, focusing on creating functional, inspiring, and environmentally responsible spaces |
419 | |||
| 84 |
Archinectarchinect.com
Established in 1997, this online architecture community and content source provides job listings, news, events, discussions, and profiles for architects and students |
418 | |||
| 85 |
STUDIOS Architecturestudios.com
An international design practice with studios in multiple cities, specializing in creating built environments that reflect clients' organizations with collaboration and expertise |
417 | |||
| 86 |
FGM Architectsfgmarchitects.com
Specializing in planning and designing various environments, from residential to educational to commercial spaces, with a focus on client service and community engagement |
407 | |||
| 87 |
Design Plusdesign-plus.com
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 |
388 | |||
| 88 |
Flad Architectsflad.com
A global leader in innovative design solutions for healthcare, higher education, and science and technology clients, empowering knowledge-based organizations to excel |
384 | |||
| 89 |
BRR Architecturebrrarch.com
A design firm with team-based approach, partnering with clients nationwide, treating projects as their own, and overcoming challenges with a straightforward process |
379 | |||
| 90 |
Galloway & Company, LLCgallowayus.com
A multidisciplinary firm in architecture, engineering, and survey services, providing full support for development projects with a collaborative, client-focused approach |
378 | |||
| 91 |
Grace Design Studiosgrace-design.com
Grace Hebert Curtis is a design firm with over 50 years of experience, providing innovative solutions and building long-term client relationships |
366 | |||
| 92 |
LJCtheljc.com
"Integrated architecture and design firm offering services in architecture, interior design, urban planning, and landscape architecture with a focus on collaboration and quality assurance" |
361 | |||
| 93 |
WENDEL Companieswendelcompanies.com
A multi-disciplinary firm offering architecture, engineering, energy efficiency, and construction management services with a focus on delivering innovative solutions nationwide |
361 | |||
| 94 |
MAPSmap-strategies.com
MAPS庐 is dedicated to providing regulatory guidance and project management for real estate, architecture, and construction to improve outcomes and reduce costs |
359 | |||
| 95 |
STRANDstrandae.com
Architecture and design firm based in Dallas, Texas, offering services worldwide Specializing in diverse projects, client-focused solutions, and sustainable design |
358 | |||
| 96 |
GreenbergFarrow (GF)greenbergfarrow.com
A fully integrated firm offering architecture, engineering, planning, interior design, landscape architecture, and land development services with 50 years of experience |
356 | |||
| 97 |
RAMSA | Robert A.M. Stern Architectsramsa.com
Global architecture specializing in residential, academic, and cultural buildings in New York City Dedicated to research-driven practices and preserving a sense of place |
356 | |||
| 98 |
RTKLcallisonrtkl.com
A global leader in sustainable design and engineering solutions for natural and built assets, addressing complex urban challenges and shaping future cities |
355 | |||
| 99 |
Excel Engineering, Inc.excelengineer.com
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 |
354 | |||
| 100 |
Huckabee | a MOREgroup brandmoregroup-inc.com
A leading educational architecture firm specializing in creating inspiring, safe, and engaging spaces for learners of all ages to expand their knowledge |
353 | |||
Turn this list into pipeline
Tamtam finds the decision-makers at every company on a list like this one, with verified emails, phone numbers and the buying signals that tell you when to reach out.
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 104,979
- Multinational companies in the United States 16,191
- Manufacturers in the United States 8,677
- Professional services firms in the United States 7,080
- Retail chains in the United States 6,981
- Financial services firms in the United States 6,867
- Companies with in-house R&D in the United States 6,794
- IT Services and IT Consulting companies in the United States 6,695
- SaaS companies in the United States 6,410
- IT services companies in the United States 5,818
- Healthcare providers in the United States 5,810
- Critical infrastructure operators in the United States 5,801
- Hospitals and Health Care companies in the United States 5,573
- Hardware manufacturers in the United States 5,344
- Software Development companies in the United States 5,311
- Financial Services companies in the United States 5,014
- Companies with a mobile app in the United States 4,663
- Consulting firms in the United States 4,383
- AI companies in the United States 4,246
- Public sector organisations in the United States 4,151
- Subscription businesses in the United States 3,923
- Real Estate companies in the United States 3,808
- Higher Education companies in the United States 3,470
- Construction companies in the United States 3,271
The same list elsewhere in United States
- Architecture and Planning companies in New York State 75
- Architecture and Planning companies in California 58
- Architecture and Planning companies in Texas 28
- Architecture and Planning companies in New York 55