# The 100 largest Civil Engineering companies in the United States

Tamtam tracks 371 Civil Engineering companies headquartered in the United States. This list ranks the 100 largest by number of employees on LinkedIn, led by AECOM, Tetra Tech and Parsons Corporation. Their median headcount is 1,220. Half of them were founded in 1956 or later. The most common headquarters are Albany (3), Baltimore (3) and Houston (3).

These are the largest civil engineering companies in the United States, representing a sector focused on infrastructure development and environmental solutions. Companies like AECOM provide global infrastructure consulting, while Tetra Tech specializes in technical solutions for water and the environment. Parsons Corporation offers critical infrastructure solutions, and CDM Smith delivers comprehensive services in water, environment, and transportation. These firms contribute to both public and private sector projects.

The list includes companies with a global reach, such as AECOM and Tetra Tech, alongside firms with a strong national presence like HNTB, an employee-owned infrastructure solutions firm. A notable pattern is the concentration of headquarters in states like California, New York, and Texas, indicating key hubs for civil engineering operations within the U.S.

🇺🇸 United States · 100 companies · Updated Nov 13, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [AECOM](https://www.tamtam.ai/c/aecom) (aecom.com)<br>A global infrastructure consulting firm providing professional services in advisory, planning, design, engineering, and construction management for public and private-sector clients | Civil Engineering | 🇺🇸 Dallas | 57,963 |  |
| 2 | [Tetra Tech](https://www.tamtam.ai/c/tetra-tech) (tetratech.com)<br>A global provider of consulting and engineering services, specializing in innovative technical solutions for water, environment, infrastructure, energy, and international development projects | Civil Engineering | 🇺🇸 Pasadena | 27,460 |  |
| 3 | [Parsons Corporation](https://www.tamtam.ai/c/parsons-corporation) (parsons.com)<br>A digitally enabled solutions provider creating future defense, intelligence, and critical infrastructure solutions with an agile and innovative approach | Civil Engineering | 🇺🇸 Chantilly | 20,710 |  |
| 4 | [Civil Engineer](https://www.tamtam.ai/c/civil-engineer) (risingindia.org)<br>A company featuring civil engineering projects, from planning and designing infrastructures to maintaining and improving existing structures for public and environmental health | Civil Engineering | 🇺🇸 New York | 17,299 | 2010 |
| 5 | [CDM Smith](https://www.tamtam.ai/c/cdm-smith) (cdmsmith.com)<br>This company provides comprehensive solutions in water, environment, transportation, energy, and facilities to worldwide public and private clients | Civil Engineering | 🇺🇸 Boston | 8,617 | 1947 |
| 6 | [URS Corporation, An AECOM Company](https://www.tamtam.ai/c/urs-corporation-an-aecom-company) (urs.com)<br>A global professional and technical services firm offering design, construction, and operations of infrastructure assets worldwide for public and private clients | Civil Engineering | 🇺🇸 San Francisco | 8,221 |  |
| 7 | [HNTB](https://www.tamtam.ai/c/hntb) (hntb.com)<br>An employee-owned infrastructure solutions firm specializing in innovative transportation systems and infrastructure solutions to connect people and expand opportunities | Civil Engineering | 🇺🇸 | 7,839 | 1914 |
| 8 | [American Hair Force](https://www.tamtam.ai/c/american-hair-force)<br>Civil engineering company located in Folsom, California, specializing in various civil engineering services in the United States | Civil Engineering | 🇺🇸 Folsom | 7,277 |  |
| 9 | [Terracon](https://www.tamtam.ai/c/terracon) (terracon.com)<br>This employee-owned consulting engineering firm offers environmental, facilities, geotechnical, and materials services for diverse private and public clients across numerous locations, both nationally and internationally. | Civil Engineering | 🇺🇸 Olathe | 7,073 | 1965 |
| 10 | [CH2M](https://www.tamtam.ai/c/ch2m) (jacobs.com)<br>global infrastructure and natural resource problems solver, creating new pathways for human progress. Engineering for governments, cities, and businesses. | Civil Engineering | 🇺🇸 Englewood | 7,008 | 1946 |
| 11 | [Van Oord](https://www.tamtam.ai/c/van-oord) (vanoord.com)<br>Leading international contractor specializing in dredging, marine engineering, and offshore projects providing innovative solutions for global maritime challenges with a focus on teamwork and marine ingenuity | Civil Engineering | 🇺🇸 3063 Nh | 4,906 |  |
| 12 | [China Railway Construction Co., Ltd.](https://www.tamtam.ai/c/china-railway-construction-co-ltd) (crcc.cn)<br>A civil engineering organization based in Beijing, specializing in construction projects and creating networking opportunities on LinkedIn for growth | Civil Engineering | 🇺🇸 Beijing | 4,855 |  |
| 13 | [NYS Department of Transportation](https://www.tamtam.ai/c/nys-department-of-transportation) (dot.ny.gov)<br>The company is responsible for coordinating transportation policy, developing facilities and services, overseeing public safety for railroads and motor carriers, and regulating carriers | Civil Engineering | 🇺🇸 Albany | 4,797 | 1967 |
| 14 | [Michael Baker International](https://www.tamtam.ai/c/michael-baker-international) (mbakerintl.com)<br>Comprehensive engineering, consulting, and technology services for infrastructure projects including design, planning, environmental, and program management across multiple sectors. | Civil Engineering | 🇺🇸 Pittsburgh | 4,466 | 1940 |
| 15 | [STV](https://www.tamtam.ai/c/stv) (stvinc.com)<br>A professional services company specializing in transportation systems, building design, water systems, and other essential infrastructure for public and private sector clients | Civil Engineering | 🇺🇸 New York | 4,301 | 1912 |
| 16 | [Atlas](https://www.tamtam.ai/c/atlas) (oneatlas.com)<br>A nationwide provider of professional testing, inspection, engineering, environmental, and consulting services for public and private sector clients in various markets | Civil Engineering | 🇺🇸 Denver | 4,185 |  |
| 17 | [TYLin](https://www.tamtam.ai/c/tylin) (tylin.com)<br>Design infrastructure solutions enhancing mobility, sustainability, resilience, and innovation to connect and elevate communities worldwide with advanced engineering approaches. | Civil Engineering | 🇺🇸 San Francisco | 3,321 |  |
| 18 | [County of Los Angeles Department of Public Works](https://www.tamtam.ai/c/county-of-los-angeles-department-of-public-works) (pw.lacounty.gov)<br>The organization plans, designs, constructs, and upkeeps modern infrastructure to enhance all communities within LA County | Civil Engineering | 🇺🇸 Alhambra | 3,303 | 1985 |
| 19 | [Florida Department of Transportation](https://www.tamtam.ai/c/florida-department-of-transportation) (fdot.gov)<br>Executive agency reporting to Governor of Florida, responsible for coordinating safe and balanced state transportation system including roadway, air, rail, sea, and more | Civil Engineering | 🇺🇸 Tallahassee | 3,241 | 1915 |
| 20 | [VHB](https://www.tamtam.ai/c/vhb) (vhb.com)<br>A diverse team of professionals dedicated to improving mobility, enhancing communities, and delivering sustainable solutions for a more resilient future | Civil Engineering | 🇺🇸 Watertown | 2,812 | 1979 |
| 21 | [JMT](https://www.tamtam.ai/c/jmt) (jmt.com)<br>This employee-owned, multi-disciplined firm offers planning, design, and construction consulting services for infrastructure projects across the United States for various clients. | Civil Engineering | 🇺🇸 Serving Clients Across the US | 2,710 |  |
| 22 | [ECS Group of Companies](https://www.tamtam.ai/c/ecs-group-of-companies) (ecslimited.com)<br>A consulting engineering firm offering geotechnical, environmental, construction materials testing, and facilities engineering services through its employee-owned subsidiaries across the US | Civil Engineering | 🇺🇸 Chantilly | 2,665 |  |
| 23 | [Kleinfelder](https://www.tamtam.ai/c/kleinfelder) (kleinfelder.com)<br>Engineering, science, and construction firm offering solutions for transportation, water, energy, and private infrastructure projects with a dedicated, cross-disciplinary team | Civil Engineering | 🇺🇸 San Diego | 2,656 |  |
| 24 | [American Society of Civil Engineers](https://www.tamtam.ai/c/american-society-of-civil-engineers) (asce.org)<br>Established in 1852, this organization represents over 150,000 members worldwide They provide conferences, education, publications, and set codes for civil engineering standards | Civil Engineering | 🇺🇸 Washington | 2,510 | 1852 |
| 25 | [Langan Engineering & Environmental Services](https://www.tamtam.ai/c/langan-engineering-and-environmental-services) (langan.com)<br>The company provides engineering and environmental consulting services globally for land development, real estate, and oil and gas industries with innovative solutions | Civil Engineering | 🇺🇸 Parsippany | 2,317 | 1970 |
| 26 | [LJA](https://www.tamtam.ai/c/lja) (lja.com)<br>Employee-owned multidisciplinary consulting firm providing civil, structural, electrical engineering, planning, surveying, and environmental services across southeastern US sectors. | Civil Engineering | 🇺🇸 | 2,294 |  |
| 27 | [Civil & Environmental Consultants, Inc.](https://www.tamtam.ai/c/civil-and-environmental-consultants-inc) (cecinc.com)<br>A comprehensive consulting firm offering innovative solutions in various areas such as air quality, civil engineering, environmental sciences, and waste management for a range of industries | Civil Engineering | 🇺🇸 Moon Township | 2,226 | 1989 |
| 28 | [Louis Berger](https://www.tamtam.ai/c/louis-berger) (wsp.com)<br>A global professional services corporation specializing in solving complex infrastructure and development challenges for various clients worldwide with integrity and expertise | Civil Engineering | 🇺🇸 Morristown | 2,162 | 1953 |
| 29 | [CHA Consulting, Inc.](https://www.tamtam.ai/c/cha-consulting-inc) (chasolutions.com)<br>Innovative engineering consulting and construction management firm offering a wide range of planning, design, and project management services to clients in North America | Civil Engineering | 🇺🇸 Albany | 2,144 | 1952 |
| 30 | [RK&K](https://www.tamtam.ai/c/rk-and-k) (rkk.com)<br>A full-service firm offering planning, engineering, environmental, and construction management services, delivering creative solutions to improve communities and prioritizing collaboration and trust | Civil Engineering | 🇺🇸 Baltimore | 2,062 | 1923 |
| 31 | [Pape-Dawson](https://www.tamtam.ai/c/pape-dawson) (pape-dawson.com)<br>A well-established company providing civil engineering, surveying, GIS, and environmental services with a focus on employee growth and community impact | Civil Engineering | 🇺🇸 San Antonio | 2,040 | 1965 |
| 32 | [MWH, now part of Stantec](https://www.tamtam.ai/c/mwh-now-part-of-stantec)<br>This company is no longer active on LinkedIn Visit their new page to learn more about their services | Civil Engineering | 🇺🇸 Broomfield | 2,022 | 1820 |
| 33 | [South Carolina Department of Transportation](https://www.tamtam.ai/c/south-carolina-department-of-transportation) (scdot.org)<br>A government agency in South Carolina developing and maintaining transportation systems, offering careers in engineering, IT, finance, HR, communications | Civil Engineering | 🇺🇸 Columbia | 1,848 |  |
| 34 | [Gannett Fleming](https://www.tamtam.ai/c/gannett-fleming) (gftinc.com)<br>A privately held AEC firm providing comprehensive infrastructure solutions in various markets including transportation, water resources, and energy Founded in 1915 | Civil Engineering | 🇺🇸 Mechanicsburg | 1,756 |  |
| 35 | [Atwell, LLC](https://www.tamtam.ai/c/atwell-llc) (atwell.com)<br>Full-service consulting, engineering, and construction firm providing customized solutions for real estate, land development, power, energy, and oil markets. | Civil Engineering | 🇺🇸 Southfield | 1,673 |  |
| 36 | [Garver](https://www.tamtam.ai/c/garver) (garverusa.com)<br>An employee-owned engineering firm founded in 1919, Garver offers multidisciplinary services in aviation, construction, transportation, and environmental planning across the US | Civil Engineering | 🇺🇸 North Little Rock | 1,600 | 1919 |
| 37 | [GEI Consultants, Inc.](https://www.tamtam.ai/c/gei-consultants-inc) (geiconsultants.com)<br>A leading firm in geotechnical, environmental, water resources, and ecological science/engineering, providing innovative solutions on projects across the globe | Civil Engineering | 🇺🇸 Woburn | 1,593 | 1970 |
| 38 | [UEM Edgenta Berhad](https://www.tamtam.ai/c/uem-edgenta-berhad) (uemedgenta.com)<br>A leading asset management and infrastructure solutions company in the region, specializing in healthcare support, property & facility solutions, and infrastructure services | Civil Engineering | 🇺🇸 The Horizon | 1,582 | 1963 |
| 39 | [Ulteig](https://www.tamtam.ai/c/ulteig) (ulteig.com)<br>An employee-owned company delivering design engineering, program management, and technical services for critical infrastructure in power, renewables, transportation, and water sectors | Civil Engineering | 🇺🇸 Fargo | 1,459 | 1944 |
| 40 | [Freese and Nichols](https://www.tamtam.ai/c/freese-and-nichols) (freese.com)<br>Professional planning, consulting, and engineering firm specializing in sustainable water and infrastructure project design and management across the United States. | Civil Engineering | 🇺🇸 Fort Worth | 1,437 | 1894 |
| 41 | [H&H](https://www.tamtam.ai/c/h-and-h) (hardestyhanover.com)<br>A full-service infrastructure engineering firm with over 135 years of experience specializing in innovative design and complex engineering solutions | Civil Engineering | 🇺🇸 New York | 1,425 | 1887 |
| 42 | [Ardurra](https://www.tamtam.ai/c/ardurra) (ardurra.com)<br>This company utilizes a mix of experience and innovation to provide customized solutions to both public and private clients | Civil Engineering | 🇺🇸 Miami | 1,417 |  |
| 43 | [Gharably Integrated Engineering Company](https://www.tamtam.ai/c/gharably-integrated-engineering-company) (gharably.com)<br>An EPC contractor in Egypt with expertise in engineering, architecture, project management, and steel manufacturing for over 70 years | Civil Engineering | 🇺🇸 Alexandria | 1,413 | 1912 |
| 44 | [WSB](https://www.tamtam.ai/c/wsb) (wsbeng.com)<br>A design and consulting firm offering engineering, planning, environmental, and construction services with over 1,100 staff nationwide, connecting dreams to reality | Civil Engineering | 🇺🇸 Minneapolis | 1,354 | 1995 |
| 45 | [BGE, Inc.](https://www.tamtam.ai/c/bge-inc) (bgeinc.com)<br>A consulting firm offering engineering, environmental, surveying, construction management, and planning services for public and private clients nationwide Visit bgeinccom for more information | Civil Engineering | 🇺🇸 Houston | 1,313 | 1975 |
| 46 | [Halff](https://www.tamtam.ai/c/halff) (halff.com)<br>Full-service engineering and architecture firm offering consulting, fostering collaboration, investing in employees, and delivering high-quality, human-centered solutions. | Civil Engineering | 🇺🇸 Richardson | 1,305 | 1950 |
| 47 | [Volkert, Inc.](https://www.tamtam.ai/c/volkert-inc) (volkert.com)<br>A long-standing engineering firm providing design services in transportation, aviation, construction, public works, utilities, property acquisition, and environmental engineering | Civil Engineering | 🇺🇸 Mobile | 1,265 | 1925 |
| 48 | [Bohler](https://www.tamtam.ai/c/bohler) (bohlerengineering.com)<br>A land development consulting firm assisting real estate professionals in identifying opportunities, accelerating growth, and achieving successful projects in various markets | Civil Engineering | 🇺🇸 Herndon | 1,261 | 1981 |
| 49 | [Stanley Consultants](https://www.tamtam.ai/c/stanley-consultants) (stanleyconsultants.com)<br>Award-winning consulting firm since 1913, providing program management, planning, design, engineering, and environmental services to diverse clients globally | Civil Engineering | 🇺🇸 Muscatine | 1,233 | 1913 |
| 50 | [Moffatt & Nichol](https://www.tamtam.ai/c/moffatt-and-nichol) (moffattnichol.com)<br>Global infrastructure advisor specializing in planning and designing coastlines, harbors, rivers, transportation, and energy facilities with a focus on excellence and customization | Civil Engineering | 🇺🇸 Long Beach | 1,220 | 1945 |
| 51 | [S&ME](https://www.tamtam.ai/c/s-and-me) (smeinc.com)<br>With over 50 years of experience, we provide engineering, environmental services, and construction testing to solve complex challenges and create positive community impacts | Civil Engineering | 🇺🇸 Raleigh | 1,204 | 1973 |
| 52 | [Dept Of The Army](https://www.tamtam.ai/c/dept-of-the-army)<br>A civil engineering company based in Bismarck, North Dakota, specializing in Department of Defense projects for the Army | Civil Engineering | 🇺🇸 Bismarck | 1,200 |  |
| 53 | [SEH](https://www.tamtam.ai/c/seh) (sehinc.com)<br>An engineering, architecture, planning, and science firm connecting clients to solutions for success in mobility, infrastructure, clean water, and more | Civil Engineering | 🇺🇸 Saint Paul | 1,099 | 1927 |
| 54 | [Timmons Group](https://www.tamtam.ai/c/timmons-group) (timmons.com)<br>An engineering & technology firm offering civil, environmental, GIS, and surveying services to clients across the US for over 30 years | Civil Engineering | 🇺🇸 Richmond | 1,086 | 1953 |
| 55 | [David Evans and Associates, Inc.](https://www.tamtam.ai/c/david-evans-and-associates-inc) (deainc.com)<br>A leader in progressive design solutions for transportation, land development, energy, and water projects nationwide, with a diverse team of professionals | Civil Engineering | 🇺🇸 Portland | 1,084 | 1976 |
| 56 | [Bolton & Menk, Inc.](https://www.tamtam.ai/c/bolton-and-menk-inc) (bolton-menk.com)<br>A leading provider of public infrastructure solutions, offering engineering, planning, and design services to help communities across the Midwest thrive | Civil Engineering | 🇺🇸 Mankato | 1,074 | 1949 |
| 57 | [Braun Intertec Corporation](https://www.tamtam.ai/c/braun-intertec-corporation) (braunintertec.com)<br>Employee-owned geotechnical engineering, environmental consulting, and testing firm with over 1,000 employee-owners promoting wellness and a culture of ownership | Civil Engineering | 🇺🇸 Minneapolis | 1,041 | 1957 |
| 58 | [Maryland State Highway Administration](https://www.tamtam.ai/c/maryland-state-highway-administration) (roads.maryland.gov)<br>A long-standing organization focused on building and maintaining quality infrastructure through a dedicated team and continuous skill development programs | Civil Engineering | 🇺🇸 Baltimore | 1,019 |  |
| 59 | [DCCM](https://www.tamtam.ai/c/dccm) (dccm.com)<br>DCCM provides design, consulting, and construction management services for infrastructure markets through a family of complementary brand companies across the United States | Civil Engineering | 🇺🇸 Houston | 1,013 | 2020 |
| 60 | [GAI Consultants, Inc.](https://www.tamtam.ai/c/gai-consultants-inc) (gaiconsultants.com)<br>An engineering, planning, and environmental consulting firm, specializing in customized solutions for clients in energy, transportation, development, government, and industrial sectors | Civil Engineering | 🇺🇸 Homestead | 1,010 | 1958 |
| 61 | [Weston & Sampson](https://www.tamtam.ai/c/weston-and-sampson) (westonandsampson.com)<br>A multidisciplinary firm offering design, engineering, and environmental services with a focus on employee empowerment, diversity, learning culture, and impactful projects | Civil Engineering | 🇺🇸 Reading | 980 | 1899 |
| 62 | [Stantec Consulting](https://www.tamtam.ai/c/stantec-consulting) (stantec.com)<br>Professional consulting firm specializing in infrastructure planning, design, surveying, civil design, security planning, and construction services, with access to added expertise and resources | Civil Engineering | 🇺🇸 Bellevue | 972 |  |
| 63 | [Simpson Gumpertz & Heger (SGH)](https://www.tamtam.ai/c/simpson-gumpertz-and-heger-sgh) (sgh.com)<br>National engineering firm providing holistic advice, advanced analysis, code consulting, and research for complex structural and building enclosure challenges | Civil Engineering | 🇺🇸 Waltham | 968 | 1956 |
| 64 | [MSV International, Inc.](https://www.tamtam.ai/c/msv-international-inc) (msvgroup.com)<br>A multidisciplinary consultancy firm with global presence, offering expertise in infrastructure projects and services to international clients worldwide | Civil Engineering | 🇺🇸 Kenmore | 966 | 2001 |
| 65 | [Lochner](https://www.tamtam.ai/c/lochner) (hwlochner.com)<br>Trusted infrastructure services provider for aviation, surface transportation, and water clients nationwide, driven by values, collaboration, and excellence | Civil Engineering | 🇺🇸 Chicago | 960 | 1944 |
| 66 | [EFI Global](https://www.tamtam.ai/c/efi-global) (efiglobal.com)<br>An international provider offering fire investigation, forensic engineering, environmental consulting, and specialty solutions to clients globally Empowering better-informed decisions with technical expertise | Civil Engineering | 🇺🇸 Tampa | 941 |  |
| 67 | [Horrocks](https://www.tamtam.ai/c/horrocks) (horrocks.com)<br>A full-service civil engineering firm designing infrastructure projects in the western United States, involving clients and communities to create connections to the future | Civil Engineering | 🇺🇸 Pleasant Grove | 920 | 1968 |
| 68 | [Wiss, Janney, Elstner Associates, Inc.](https://www.tamtam.ai/c/wiss-janney-elstner-associates-inc) (wje.com)<br>Global firm of engineers, architects, and materials scientists providing innovative solutions for problem-solving, repairs, and prevention in the built world | Civil Engineering | 🇺🇸 Northbrook | 909 | 1956 |
| 69 | [Parametrix](https://www.tamtam.ai/c/parametrix) (parametrix.com)<br>Parametrix helps clients envision sustainable and vibrant communities while delivering inspired solutions for complex infrastructure and environmental projects #IMAGINEParametrix | Civil Engineering | 🇺🇸 Seattle | 899 | 1969 |
| 70 | [McKim & Creed, Inc.](https://www.tamtam.ai/c/mckim-and-creed-inc) (mckimcreed.com)<br>Engineering and surveying firm using innovative tools to solve infrastructure challenges and improve lives through clean water, energy-efficient facilities, and sustainable communities | Civil Engineering | 🇺🇸 Raleigh | 866 | 1978 |
| 71 | [HBK Engineering, LLC](https://www.tamtam.ai/c/hbk-engineering-llc) (hbkengineering.com)<br>A professional engineering design team providing civil, environmental, structural, electrical, and utility services with a focus on accurate, time-sensitive projects | Civil Engineering | 🇺🇸 Chicago | 838 | 1999 |
| 72 | [New York State Thruway Authority](https://www.tamtam.ai/c/new-york-state-thruway-authority) (thruway.ny.gov)<br>The company operates and maintains the NYS Thruway System, a vital transportation corridor connecting cities, rural areas, and tourist destinations with cashless tolling | Civil Engineering | 🇺🇸 Albany | 832 | 1954 |
| 73 | [Burgess & Niple](https://www.tamtam.ai/c/burgess-and-niple) (burgessniple.com)<br>Nationally recognized engineering and architecture design firm focused on developing practical infrastructure solutions with a passion for quality, safety, and sustainability | Civil Engineering | 🇺🇸 Columbus | 828 | 1912 |
| 74 | [TranSystems](https://www.tamtam.ai/c/transystems) (transystems.com)<br>Transportation and infrastructure consulting firm enhancing communities with innovative planning, design, and construction solutions from professionals across the US | Civil Engineering | 🇺🇸 Kansas City | 819 |  |
| 75 | [Wade Trim](https://www.tamtam.ai/c/wade-trim) (wadetrim.com)<br>The company specializes in solving engineering challenges to enhance infrastructure, create stronger communities, and deliver customized solutions with excellent communication | Civil Engineering | 🇺🇸 Detroit | 817 | 1926 |
| 76 | [Professional Service Industries, Inc. (PSI)](https://www.tamtam.ai/c/professional-service-industries-inc-psi) (intertek.com)<br>A leading provider of quality solutions in the construction industry, offering integrated engineering, testing, and assurance services to a broad customer base | Civil Engineering | 🇺🇸 Arlington Heights | 810 | 1961 |
| 77 | [WGI](https://www.tamtam.ai/c/wgi) (wginc.com)<br>An award-winning professional services provider dedicated to creatively transforming how the world is envisioned, designed, and experienced for clients | Civil Engineering | 🇺🇸 West Palm Beach | 808 | 1972 |
| 78 | [GPD Group](https://www.tamtam.ai/c/gpd-group) (gpdgroup.com)<br>A multi-disciplinary firm offering architectural design, engineering, construction, telecommunications, and environmental services across various market sectors with over 700 professionals | Civil Engineering | 🇺🇸 Akron | 806 | 1961 |
| 79 | [Psomas](https://www.tamtam.ai/c/psomas) (psomas.com)<br>A full-service consulting firm specializing in award-winning projects with a focus on sustainability in Transportation, Water, Facilities, Land Development, Energy, and Federal markets | Civil Engineering | 🇺🇸 Los Angeles | 799 | 1946 |
| 80 | [Wilson & Company, Inc., Engineers and Architects](https://www.tamtam.ai/c/wilson-and-company-inc-engineers-and-architects) (wilsonco.com)<br>A multidisciplinary firm with 90 years of experience in engineering, architecture, planning, and more, serving diverse clients across multiple states | Civil Engineering | 🇺🇸 Albuquerque | 795 | 1932 |
| 81 | [Whitman, Requardt and Associates, LLP](https://www.tamtam.ai/c/whitman-requardt-and-associates-llp) (wrallp.com)<br>A nationally-recognized firm providing engineering, architectural, and environmental planning services with a focus on client service, quality work, and forward thinking solutions | Civil Engineering | 🇺🇸 Baltimore | 785 | 1915 |
| 82 | [Nevada Department of Transportation](https://www.tamtam.ai/c/nevada-department-of-transportation) (dot.nv.gov)<br>A transportation department responsible for planning, constructing, and maintaining Nevada's highways, bridges, and various transportation modes to enhance safety and economic development | Civil Engineering | 🇺🇸 Carson City | 779 | 1917 |
| 83 | [BKF Engineers](https://www.tamtam.ai/c/bkf-engineers) (bkf.com)<br>A California-based engineering firm offering services in engineering, surveying, and land planning for various industries and projects for over 100 years | Civil Engineering | 🇺🇸 Oakland | 777 | 1915 |
| 84 | [American Structurepoint](https://www.tamtam.ai/c/american-structurepoint) (structurepoint.com)<br>Providing innovative engineering, design, and consulting services across various disciplines to support projects from concept through completion. | Civil Engineering | 🇺🇸 Indianapolis | 767 | 1966 |
| 85 | [Raba Kistner, Inc.](https://www.tamtam.ai/c/raba-kistner-inc) (rkci.com)<br>An engineering consulting and program management firm dedicated to building a more sustainable world through a variety of services in multiple markets | Civil Engineering | 🇺🇸 San Antonio | 754 |  |
| 86 | [BSC Group](https://www.tamtam.ai/c/bsc-group) (bscgroup.com)<br>Multidisciplinary consulting firm providing civil engineering, environmental services, surveying, transportation planning, landscape architecture, structural engineering, and custom software solutions | Civil Engineering | 🇺🇸 Boston | 737 | 1965 |
| 87 | [HR Green, Inc.](https://www.tamtam.ai/c/hr-green-inc) (hrgreen.com)<br>A solutions provider founded in 1913, focused on building communities and improving lives through engineering, management, and collaboration in various markets | Civil Engineering | 🇺🇸 Cedar Rapids | 731 | 1913 |
| 88 | [KSA](https://www.tamtam.ai/c/ksa) (ksaeng.com)<br>A leading industry provider of engineering, architecture, planning, surveying, and construction management services with a strong focus on employee development and recognition | Civil Engineering | 🇺🇸 Longview | 726 | 1978 |
| 89 | [Hatch Mott MacDonald](https://www.tamtam.ai/c/hatch-mott-macdonald) (hatchmott.com)<br>An award-winning engineering firm with over 100 years of experience in North America, specializing in transportation, water supply, environment, and utilities Recruiting motivated professionals | Civil Engineering | 🇺🇸 Iselin | 716 | 1996 |
| 90 | [Schnabel Engineering](https://www.tamtam.ai/c/schnabel-engineering) (schnabel-eng.com)<br>Trusted partner in geotechnical, dam, and tunnel engineering projects worldwide Top design firm offering big-firm capabilities with small-firm responsiveness | Civil Engineering | 🇺🇸 Glen Allen | 701 | 1956 |
| 91 | [MSA](https://www.tamtam.ai/c/msa) (msaonline.com)<br>A Small Business Enterprise in Virginia Beach providing innovative solutions in Environmental Sciences, Land Surveying, Civil and Environmental Engineering to diverse clientele | Civil Engineering | 🇺🇸 Virginia Beach | 696 | 1973 |
| 92 | [C&S Companies](https://www.tamtam.ai/c/c-and-s-companies) (cscos.com)<br>A nationwide provider of client-focused engineering, architecture, planning, environmental, and construction services, with expertise in a wide range of disciplines | Civil Engineering | 🇺🇸 Syracuse | 692 | 1968 |
| 93 | [Cadeploy](https://www.tamtam.ai/c/cadeploy) (cadeploy.com)<br>A fast-growing Engineering solutions company offering detailed services in construction, industrial, infrastructure, automotive, and aerospace sectors with a commitment to quality and reliability | Civil Engineering | 🇺🇸 Danville | 685 | 2012 |
| 94 | [KLJ](https://www.tamtam.ai/c/klj) (kljeng.com)<br>A company specializing in planning, designing, and supporting infrastructure projects nationwide, focusing on putting clients first to turn visions into reality | Civil Engineering | 🇺🇸 Bismarck | 673 | 1938 |
| 95 | [Quiddity](https://www.tamtam.ai/c/quiddity) (quiddity.com)<br>A full-service civil engineering and consulting firm with over 500 employees, providing engineering solutions to enhance communities through excellence and core values | Civil Engineering | 🇺🇸 Houston | 668 | 1976 |
| 96 | [Tighe & Bond](https://www.tamtam.ai/c/tighe-and-bond) (tighebond.com)<br>Tighe & Bond is a regional engineering and environmental consulting firm committed to creative, collaborative solutions that benefit clients and communities | Civil Engineering | 🇺🇸 Westfield | 658 | 1911 |
| 97 | [USAF Civil Engineer](https://www.tamtam.ai/c/usaf-civil-engineer)<br>The company's core mission is to build, operate, maintain, modernize, and recover installations, developing creative solutions to complex problems worldwide | Civil Engineering | 🇺🇸 Washington | 648 | 1947 |
| 98 | [Neel-Schaffer, Inc.](https://www.tamtam.ai/c/neel-schaffer-inc) (neel-schaffer.com)<br>Multi-disciplined engineering and planning firm offering transportation, civil site, environmental, water/wastewater services across the South with a focus on community improvement | Civil Engineering | 🇺🇸 Jackson | 647 | 1983 |
| 99 | [PMC (Now a part of Michael Baker International)](https://www.tamtam.ai/c/pmc-now-a-part-of-michael-baker-international) (mbakerintl.com)<br>A leading provider of engineering, development, intelligence, and technology solutions with global reach, offering services in infrastructure and asset projects worldwide | Civil Engineering | 🇺🇸 Pittsburgh | 636 | 1940 |
| 100 | [U.S. Army Corps of Engineers, North Atlantic Division](https://www.tamtam.ai/c/u-s-army-corps-of-engineers-north-atlantic-division) (nad.usace.army.mil)<br>A team in North Atlantic Division executing diverse engineering projects worldwide to support the military, protect water resources, and enhance the environment | Civil Engineering | 🇺🇸 Fort Hamilton | 634 |  |

## 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 13, 2026.

## More company lists in the United States

- [The largest companies in the United States](https://www.tamtam.ai/l/largest-companies-united-states) (104,977)
- [Multinational companies in the United States](https://www.tamtam.ai/l/multinational-companies-united-states) (16,192)
- [Manufacturers in the United States](https://www.tamtam.ai/l/manufacturers-united-states) (8,678)
- [Professional services firms in the United States](https://www.tamtam.ai/l/professional-services-firms-united-states) (7,079)
- [Retail chains in the United States](https://www.tamtam.ai/l/retail-chains-united-states) (6,980)
- [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) (4,382)
- [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

- [Civil Engineering companies in California](https://www.tamtam.ai/l/civil-engineering-companies-california) (47)
- [Civil Engineering companies in New York State](https://www.tamtam.ai/l/civil-engineering-companies-new-york-state) (37)
- [Civil Engineering companies in Texas](https://www.tamtam.ai/l/civil-engineering-companies-texas) (26)

## The same list elsewhere

- [Civil Engineering companies in the world](https://www.tamtam.ai/l/civil-engineering-companies-in-the-world) (1,573)
- [Civil Engineering companies in North America](https://www.tamtam.ai/l/civil-engineering-companies-in-north-america) (424)

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Source: https://www.tamtam.ai/l/civil-engineering-companies-united-states