The 100 largest Civil Engineering companies in the United States (2026 list)

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.

#	Company	Industry	Headquarters	Employees	Founded
1	AECOM aecom.com 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	n/a
2	Tetra Tech tetratech.com 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	n/a
3	Parsons Corporation parsons.com A digitally enabled solutions provider creating future defense, intelligence, and critical infrastructure solutions with an agile and innovative approach	Civil Engineering	🇺🇸 Chantilly	20,710	n/a
4	Civil Engineer risingindia.org 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 cdmsmith.com 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 urs.com 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	n/a
7	HNTB hntb.com 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 Civil engineering company located in Folsom, California, specializing in various civil engineering services in the United States	Civil Engineering	🇺🇸 Folsom	7,277	n/a
9	Terracon terracon.com 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 jacobs.com 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 vanoord.com 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	n/a
12	China Railway Construction Co., Ltd.crcc.cn A civil engineering organization based in Beijing, specializing in construction projects and creating networking opportunities on LinkedIn for growth	Civil Engineering	🇺🇸 Beijing	4,855	n/a
13	NYS Department of Transportation dot.ny.gov 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 mbakerintl.com 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 stvinc.com 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 oneatlas.com 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	n/a
17	TYLin tylin.com 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	n/a
18	County of Los Angeles Department of Public Works pw.lacounty.gov 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 fdot.gov 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 vhb.com 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 jmt.com 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	n/a
22	ECS Group of Companies ecslimited.com 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	n/a
23	Kleinfelder kleinfelder.com 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	n/a
24	American Society of Civil Engineers asce.org 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 langan.com 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 lja.com Employee-owned multidisciplinary consulting firm providing civil, structural, electrical engineering, planning, surveying, and environmental services across southeastern US sectors.	Civil Engineering	🇺🇸	2,294	n/a
27	Civil & Environmental Consultants, Inc.cecinc.com 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 wsp.com 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.chasolutions.com 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 rkk.com 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 pape-dawson.com 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 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 scdot.org A government agency in South Carolina developing and maintaining transportation systems, offering careers in engineering, IT, finance, HR, communications	Civil Engineering	🇺🇸 Columbia	1,848	n/a
34	Gannett Fleming gftinc.com 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	n/a
35	Atwell, LLC atwell.com 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	n/a
36	Garver garverusa.com 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.geiconsultants.com 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 uemedgenta.com 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 ulteig.com 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 freese.com 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 hardestyhanover.com 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 ardurra.com This company utilizes a mix of experience and innovation to provide customized solutions to both public and private clients	Civil Engineering	🇺🇸 Miami	1,417	n/a
43	Gharably Integrated Engineering Company gharably.com 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 wsbeng.com 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.bgeinc.com 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 halff.com 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.volkert.com 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 bohlerengineering.com 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 stanleyconsultants.com 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 moffattnichol.com 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
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. Get more companies, free
51	S&ME smeinc.com 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 A civil engineering company based in Bismarck, North Dakota, specializing in Department of Defense projects for the Army	Civil Engineering	🇺🇸 Bismarck	1,200	n/a
53	SEH sehinc.com 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 timmons.com 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.deainc.com 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.bolton-menk.com 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 braunintertec.com 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 roads.maryland.gov 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	n/a
59	DCCM dccm.com 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.gaiconsultants.com 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 westonandsampson.com 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 stantec.com 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	n/a
63	Simpson Gumpertz & Heger (SGH)sgh.com 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.msvgroup.com 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 hwlochner.com 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 efiglobal.com 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	n/a
67	Horrocks horrocks.com 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.wje.com 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 parametrix.com 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.mckimcreed.com 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 hbkengineering.com 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 thruway.ny.gov 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 burgessniple.com 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 transystems.com Transportation and infrastructure consulting firm enhancing communities with innovative planning, design, and construction solutions from professionals across the US	Civil Engineering	🇺🇸 Kansas City	819	n/a
75	Wade Trim wadetrim.com 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)intertek.com 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 wginc.com 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 gpdgroup.com 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 psomas.com 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 wilsonco.com 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 wrallp.com 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 dot.nv.gov 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 bkf.com 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 structurepoint.com 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.rkci.com 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	n/a
86	BSC Group bscgroup.com 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.hrgreen.com 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 ksaeng.com 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 hatchmott.com 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 schnabel-eng.com 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 msaonline.com 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 cscos.com 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 cadeploy.com 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 kljeng.com 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 quiddity.com 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 tighebond.com 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 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.neel-schaffer.com 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)mbakerintl.com 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 nad.usace.army.mil 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	n/a

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.

Build your own list, free

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.

The 100 largest Civil Engineering companies in the United States

Want more companies than this list?

Turn this list into pipeline

How this list is built

More company lists in the United States

The same list elsewhere in United States

The same list elsewhere