# The 50 largest Engineering Services companies in the United States

Tamtam tracks 203 Engineering Services companies headquartered in the United States. This list ranks the 50 largest by number of employees on LinkedIn, led by Black & Veatch, Kimley-Horn and FieldCore. Their median headcount is 1,313. Half of them were founded in 1975 or later. The most common headquarters are Houston (4) and Atlanta (2).

These US-based engineering services companies offer a range of specialized solutions across diverse sectors. They include large established firms such as Black & Veatch, a global leader in critical human infrastructure, and Kimley-Horn, which provides comprehensive planning and design consulting. Other notable firms are NV5, offering technology and consulting for sustainable infrastructure, and POWER Engineers, providing integrated solutions for energy and food and beverage markets. Many of these firms are employee-owned, indicating a common business model in the sector.

The companies listed primarily focus on infrastructure, energy, environmental solutions, and government services. For instance, FieldCore specializes in power, wind, and electrification solutions, while Dewberry offers professional services to public and private sector clients. A significant number of these companies were founded in the mid-to-late 20th century, suggesting a period of growth and establishment for engineering services in the United States.

🇺🇸 United States · 50 companies · Updated Nov 12, 2026

| # | Company | Industry | Headquarters | Employees | Founded |
|---|---|---|---|---|---|
| 1 | [Black & Veatch](https://www.tamtam.ai/c/black-and-veatch) (bv.com)<br>An employee-owned global leader in building critical human infrastructure in Energy, Water, Telecommunications, and Government Services since 1915 | Engineering Services | 🇺🇸 Overland Park | 11,691 | 1915 |
| 2 | [Kimley-Horn](https://www.tamtam.ai/c/kimley-horn) (kimley-horn.com)<br>providing comprehensive planning and design consulting services across multiple disciplines with a client-focused approach and recognized workplace quality | Engineering Services | 🇺🇸 Raleigh | 10,392 | 1967 |
| 3 | [FieldCore](https://www.tamtam.ai/c/fieldcore) (fieldcore.com)<br>Global energy company specializing in power, wind, and electrification solutions, supported by advanced research, consulting, and financial services for a lower carbon future | Engineering Services | 🇺🇸 Atlanta | 4,952 | 2017 |
| 4 | [Cocacola Now](https://www.tamtam.ai/c/cocacola-now) (yahoo.com)<br>Lorem Ipsum provides standard dummy text for printing and typesetting, surviving for centuries and adapting to electronic and digital publishing | Engineering Services | 🇺🇸 Palo Alto | 3,968 | 1977 |
| 5 | [NV5](https://www.tamtam.ai/c/nv5) (nv5.com)<br>Provider of technology, conformity assessment, and consulting solutions for sustainable infrastructure, utility, and building assets Multiple verticals include engineering, environmental health, and geospatial services | Engineering Services | 🇺🇸 Hollywood | 3,633 | 1947 |
| 6 | [POWER Engineers](https://www.tamtam.ai/c/power-engineers) (wsp.com)<br>Global engineering firm providing integrated solutions for energy, food and beverage, facilities, communications, environmental, and federal markets with multidiscipline services | Engineering Services | 🇺🇸 Hailey | 3,392 |  |
| 7 | [ILF Consulting Engineers](https://www.tamtam.ai/c/ilf-consulting-engineers) (ilf.com)<br>Engineering and consulting firm providing technical expertise for industrial and infrastructure projects across energy, water, transportation, and sustainable industries worldwide. | Engineering Services | 🇺🇸 Worldwide | 3,272 |  |
| 8 | [Dewberry](https://www.tamtam.ai/c/dewberry) (dewberry.com)<br>A market-leading firm providing professional services to public and private sector clients, solving complex challenges, and transforming communities through innovation and expertise | Engineering Services | 🇺🇸 Fairfax | 2,914 | 1956 |
| 9 | [KCI](https://www.tamtam.ai/c/kci) (kci.com)<br>Employee-owned engineering firm providing multi-disciplined services in transportation, resource management, environmental, and construction to government, institutional, and private-sector clients nationwide | Engineering Services | 🇺🇸 Sparks | 2,900 | 1955 |
| 10 | [Scientific Research Corporation](https://www.tamtam.ai/c/scientific-research-corporation) (scires.com)<br>An engineering company founded in 1988, providing innovative solutions to US Government, private industry, and international markets with focus on information, communications, intelligence, and more | Engineering Services | 🇺🇸 Atlanta | 2,534 | 1988 |
| 11 | [UES](https://www.tamtam.ai/c/ues) (teamues.com)<br>A nationwide provider of engineering, environmental, testing, and inspection services, specializing in sustainable infrastructure solutions for public and private clients across various industries | Engineering Services | 🇺🇸 Orlando | 2,428 | 1964 |
| 12 | [Salas O'Brien](https://www.tamtam.ai/c/salas-o-brien) (salasobrien.com)<br>Employee-owned engineering firm focused on advancing the human experience through the built environment Top-ranked, with a strong emphasis on impact and sustainability | Engineering Services | 🇺🇸 Irvine | 2,295 | 1975 |
| 13 | [Olsson](https://www.tamtam.ai/c/olsson) (olsson.com)<br>An employee-owned engineering and design firm focused on improving communities through sustainable, connected, and efficient projects, driven by inspired people and purposeful designs | Engineering Services | 🇺🇸 Lincoln | 2,270 | 1956 |
| 14 | [Bowman Consulting](https://www.tamtam.ai/c/bowman-consulting) (bowman.com)<br>A national engineering services provider delivering infrastructure solutions to customers in various regulated end markets, with expertise in planning, engineering, and environmental consulting | Engineering Services | 🇺🇸 Reston | 2,221 | 1995 |
| 15 | [Core States Group](https://www.tamtam.ai/c/core-states-group) (core-states.com)<br>A collaborative team offering architecture, interior design, engineering, program management, and construction solutions nationwide, focused on facilitating a remarkable customer experience | Engineering Services | 🇺🇸 West Chester | 2,134 | 1999 |
| 16 | [Pinnacle](https://www.tamtam.ai/c/pinnacle-pasadena) (pinnaclereliability.com)<br>A company based in Pasadena, focused on helping industrial facilities in oil and gas, chemical, mining, and water industries optimize data for improved performance | Engineering Services | 🇺🇸 Pasadena | 1,701 | 2006 |
| 17 | [Audubon Companies](https://www.tamtam.ai/c/audubon-companies) (auduboncompanies.com)<br>A leading provider of EPC, consulting, fabrication, and technical services for energy, chemicals, power, infrastructure, and industrial markets with a focus on sustainability | Engineering Services | 🇺🇸 Houston | 1,680 | 1997 |
| 18 | [BW Design Group](https://www.tamtam.ai/c/bw-design-group) (bwdesigngroup.com)<br>This company is a fully integrated engineering, architecture, construction, and consulting firm serving leading companies with customized solutions | Engineering Services | 🇺🇸 St. Louis | 1,676 | 1986 |
| 19 | [Qualus](https://www.tamtam.ai/c/qualus) (qualuscorp.com)<br>Innovative power services firm specializing in grid modernization, resiliency, sustainability, and software solutions for utilities, commercial, industrial, and government clients | Engineering Services | 🇺🇸 Usa | 1,668 |  |
| 20 | [Westwood Professional Services](https://www.tamtam.ai/c/westwood-professional-services) (westwoodps.com)<br>A dedicated team with over 50 years of experience creating a better world through energy grid transformation, resilient infrastructure design, and community development | Engineering Services | 🇺🇸 Plano | 1,660 | 1972 |
| 21 | [SSOE Group](https://www.tamtam.ai/c/ssoe-group) (ssoe.com)<br>Internationally recognized architecture and engineering firm specializing in providing high-quality project solutions for various industries with global reach | Engineering Services | 🇺🇸 Toledo | 1,634 | 1948 |
| 22 | [Walter P Moore](https://www.tamtam.ai/c/walter-p-moore) (walterpmoore.com)<br>A team of engineers and innovators designing high-performance structures and infrastructure globally, providing cost-efficient solutions that shape communities worldwide | Engineering Services | 🇺🇸 Houston | 1,340 | 1931 |
| 23 | [Pennoni](https://www.tamtam.ai/c/pennoni) (pennoni.com)<br>The firm partners with clients to deliver innovative, sustainable, and resilient engineering solutions, fostering long-term relationships focused on community impact | Engineering Services | 🇺🇸 Philadelphia | 1,317 | 1966 |
| 24 | [Pyrotek](https://www.tamtam.ai/c/pyrotek) (pyrotek.com)<br>Global engineering leader providing performance-improving technical solutions for industries like aluminium, glass, and automotive with a focus on innovation and customer satisfaction | Engineering Services | 🇺🇸 Spokane | 1,314 | 1956 |
| 25 | [Holtec International](https://www.tamtam.ai/c/holtec-international) (holtecinternational.com)<br>Global leader in designing and manufacturing custom energy equipment for nuclear, solar, geothermal, and fossil power generation, with a focus on integrity and innovation | Engineering Services | 🇺🇸 Jupiter | 1,313 | 1986 |
| 26 | [Moldtek Technologies Limited](https://www.tamtam.ai/c/moldtek-technologies-limited) (moldtekengineering.com)<br>Moldtek Technologies offers engineering design support globally across various industries, shaping solutions for clients with top-tier expertise and delivery centers in India | Engineering Services | 🇺🇸 Cumming | 1,296 | 2001 |
| 27 | [RGBSI](https://www.tamtam.ai/c/rgbsi) (rgbsi.com)<br>Delivering engineering and quality solutions globally, bridging strategy and execution with in-house technologies to enhance performance and drive innovation | Engineering Services | 🇺🇸 Troy | 1,198 | 1997 |
| 28 | [Willdan](https://www.tamtam.ai/c/willdan) (willdan.com)<br>A consulting firm offering technical services in energy efficiency, engineering, public finance, and more to utilities, public agencies, and private industry nationwide | Engineering Services | 🇺🇸 Anaheim | 1,169 | 1964 |
| 29 | [Barnhart Crane & Rigging](https://www.tamtam.ai/c/barnhart-crane-and-rigging) (barnhartcrane.com)<br>Leading provider of crane rentals, heavy haul, and engineered rigging solutions across North America, specializing in complex industrial lifting and transportation projects. | Engineering Services | 🇺🇸 Memphis | 1,155 | 1969 |
| 30 | [Prime Controls](https://www.tamtam.ai/c/prime-controls) (prime-controls.com)<br>Industrial Automation company offering sole source solutions for system integration, I & C construction, project design, maintenance, and factory support services Customer-focused with commitment to excellence | Engineering Services | 🇺🇸 Lewisville | 1,095 | 2004 |
| 31 | [Pond & Company](https://www.tamtam.ai/c/pond-and-company) (pondco.com)<br>A full-service consulting firm offering engineering, architecture, planning, and construction management solutions to public and private clients globally since 1965 | Engineering Services | 🇺🇸 Peachtree Corners | 1,003 | 1965 |
| 32 | [Dalkia UK](https://www.tamtam.ai/c/dalkia-uk) (dalkia.co.uk)<br>Delivering technical solutions for a sustainable future, specializing in energy, engineering, facilities management, and specialist services for private and public sector clients | Engineering Services | 🇺🇸 Staines-upon-Thames | 990 | 1993 |
| 33 | [Arcfield](https://www.tamtam.ai/c/arcfield) (arcfield.com)<br>Provider of systems engineering and integration services to US Intelligence Community and Department of Defense, with expertise in advanced engineering, IT, and analysis | Engineering Services | 🇺🇸 Chantilly | 949 | 2021 |
| 34 | [The Foth Companies](https://www.tamtam.ai/c/the-foth-companies) (foth.com)<br>A multidisciplinary firm providing innovative solutions in science, engineering, and technology, focused on client-centered service, collaboration, and delivering results | Engineering Services | 🇺🇸 De Pere | 895 | 1938 |
| 35 | [Mesa Associates, Inc](https://www.tamtam.ai/c/mesa-associates-inc) (mesainc.com)<br>Full service engineering firm specializing in serving electric utility, industrial, and government clients with expertise in power delivery and various engineering disciplines since 1988 | Engineering Services | 🇺🇸 Madison | 882 | 1988 |
| 36 | [Bechtel Plant Machinery, Inc. (BPMI)](https://www.tamtam.ai/c/bechtel-plant-machinery-inc-bpmi) (bpmionline.com)<br>Provides design, manufacturing, and procurement management for high-quality nuclear power plant components in submarines and aircraft carriers Also offers IT solutions | Engineering Services | 🇺🇸 Monroeville | 841 | 1956 |
| 37 | [ENSCO, Inc.](https://www.tamtam.ai/c/ensco-inc) (ensco.com)<br>Provides leading-edge engineering, science, and advanced technology solutions to governments and private industries in aerospace, national security, and surface transportation sectors. | Engineering Services | 🇺🇸 Vienna | 745 | 1969 |
| 38 | [DLB Associates](https://www.tamtam.ai/c/dlb-associates) (dlbassociates.com)<br>DLB Associates are MEP & Technology consulting engineers, offering personalized, adaptive solutions through imagination, expertise, agility, and practicality for clients | Engineering Services | 🇺🇸 Neptune | 722 | 1980 |
| 39 | [Fike Corporation](https://www.tamtam.ai/c/fike-corporation) (fike.com)<br>Designs and manufactures rupture discs, explosion protection, fire alarm, and suppression systems for global businesses seeking disaster prevention and safety assurance. | Engineering Services | 🇺🇸 Blue Springs | 692 | 1945 |
| 40 | [Algoworks](https://www.tamtam.ai/c/algoworks) (algoworks.com)<br>An IT powerhouse since 2006, leading digital transformations with expertise in Salesforce, Mobility, DevOps, and App Development for global businesses | Engineering Services | 🇺🇸 Ramsey | 662 | 2006 |
| 41 | [Wunderlich-Malec Engineering, Inc.](https://www.tamtam.ai/c/wunderlich-malec-engineering-inc) (wmeng.com)<br>An established engineering company specializing in solutions for industrial process plants, offering expertise, experience, and resources for critical control systems | Engineering Services | 🇺🇸 Eden Prairie | 661 | 1981 |
| 42 | [RRC Companies](https://www.tamtam.ai/c/rrc-companies) (rrccompanies.com)<br>Top-tier engineering firm specializing in utility-scale renewable energy projects, offering comprehensive engineering services and dedicated to creating solutions that exceed expectations | Engineering Services | 🇺🇸 Round Rock | 617 | 2007 |
| 43 | [Enventure Engineering](https://www.tamtam.ai/c/enventure-engineering) (enventure.com)<br>A leading Engineering, Supply Chain, and Compliance solutions provider with expertise in engineering services, master data management, asset management, and compliance solutions | Engineering Services | 🇺🇸 Chicago | 603 | 1997 |
| 44 | [Saber Power](https://www.tamtam.ai/c/saber-power) (saberpower.com)<br>Engineering-led professional services company specializing in medium and high voltage electrical infrastructure Offering turnkey EPC, construction, maintenance, emergency response, training, and engineering services globally | Engineering Services | 🇺🇸 Houston | 597 | 2010 |
| 45 | [Cobb, Fendley & Associates, Inc.](https://www.tamtam.ai/c/cobb-fendley-and-associates-inc) (cobbfendley.com)<br>A Texas-based firm offering engineering, surveying, and infrastructure solutions for public and private sector clients, specializing in various professional services | Engineering Services | 🇺🇸 Houston | 577 | 1980 |
| 46 | [Middough Inc.](https://www.tamtam.ai/c/middough-inc) (middough.com)<br>A top US firm providing engineering, architectural, and management services worldwide for a range of industries since 1950 | Engineering Services | 🇺🇸 Cleveland | 575 | 1950 |
| 47 | [Eximietas Design](https://www.tamtam.ai/c/eximietas-design) (eximietas.design)<br>Leading technology consulting firm specializing in chip design, firmware development, embedded software, cloud computing, cyber security, and AI/ML solutions | Engineering Services | 🇺🇸 San Jose | 558 | 2023 |
| 48 | [Sterling Engineering](https://www.tamtam.ai/c/sterling-engineering) (sterling-engineering.com)<br>An award-winning company providing engineering project services and technical recruitment across industries, offering flexible solutions to clients since 1969 | Engineering Services | 🇺🇸 Westchester | 556 | 1969 |
| 49 | [Vanderweil Engineers](https://www.tamtam.ai/c/vanderweil-engineers) (vanderweil.com)<br>Engineering firm specializing in mechanical, electrical, plumbing, and sustainable design solutions for a wide range of projects, prioritizing client service and environmental impact | Engineering Services | 🇺🇸 Boston | 553 | 1950 |
| 50 | [Orbital Engineering, Inc.](https://www.tamtam.ai/c/orbital-engineering-inc) (orbitalengr.com)<br>Orbital Engineering provides full-service engineering, risk mitigation, and project delivery solutions tailored to meet customer needs across various industries | Engineering Services | 🇺🇸 Pittsburgh | 553 | 1969 |

## 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 12, 2026.

## More company lists in the United States

- [The largest companies in the United States](https://www.tamtam.ai/l/largest-companies-united-states) (104,975)
- [Multinational companies in the United States](https://www.tamtam.ai/l/multinational-companies-united-states) (16,197)
- [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) (6,981)
- [Financial services firms in the United States](https://www.tamtam.ai/l/financial-services-firms-united-states) (6,864)
- [Companies with in-house R&D in the United States](https://www.tamtam.ai/l/r-and-d-companies-united-states) (6,796)
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- [Construction companies in the United States](https://www.tamtam.ai/l/construction-companies-united-states) (3,271)

## The same list elsewhere

- [Engineering Services companies in the world](https://www.tamtam.ai/l/engineering-services-companies-in-the-world) (1,150)
- [Engineering Services companies in North America](https://www.tamtam.ai/l/engineering-services-companies-in-north-america) (258)

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