The engineering industry in the USA covers a wide range of work, from highways and bridges to water systems, energy projects, buildings and environmental services. Large engineering firms often work across several of these areas rather than staying within one type of project.

Some companies on this list focus strongly on infrastructure. Others have built their businesses around water and environmental work, energy, construction or transportation. A few also combine engineering with architecture, consulting and project management.

This article covers 10 major engineering firms in the USA based on the latest rankings and industry information provided in the source material. The list considers revenue, market position and the type of engineering work handled by each company. It is not a ranking based on one single engineering specialty.

Quick Look at the Top 10 Engineering Firms in the USA

Rank	Engineering Firm	Headquarters	Main Work
1	Jacobs Solutions Inc.	Dallas, TX	Infrastructure, water and advanced manufacturing
2	AECOM	Dallas, TX / Los Angeles, CA	Transportation, environment and facilities
3	Tetra Tech	Pasadena, CA	Water, environment and sustainable infrastructure
4	WSP USA	New York, NY	Transportation, property and buildings
5	Fluor Corporation	Irving, TX	Engineering, procurement and construction
6	HDR	Omaha, NE	Infrastructure, transportation and health
7	Burns & McDonnell	Kansas City, MO	Engineering, construction and architecture
8	Kimley-Horn	Raleigh, NC	Civil and transportation engineering
9	Stantec	Irvine, CA	Infrastructure, community development and environment
10	HNTB Cos.	Kansas City, MO	Highways, bridges and transit

1. Jacobs Solutions Inc.

Headquarters: Dallas, TX
Main Business: Infrastructure, water, technical and scientific services

Jacobs Solutions Inc. is one of the largest engineering and professional services companies in the USA. Its work covers infrastructure, water, advanced manufacturing and other technical projects.

The company works across several parts of the engineering market rather than focusing on one type of project. Its services also include technical and scientific work connected with complex projects.

Infrastructure is a major part of its business. Water and advanced manufacturing add other important areas, giving Jacobs a broad range of engineering work.

Its position at the top of this list reflects both the size of its operations and the range of services it provides.

Unique Offerings

● Infrastructure services
● Water engineering
● Advanced manufacturing
● Technical services
● Scientific project delivery

Official website: Jacobs Solutions Inc.

2. AECOM

Headquarters: Dallas, TX / Los Angeles, CA
Main Business: Infrastructure consulting, transportation and facilities

AECOM is a major infrastructure consulting and engineering company. Its work includes transportation, environmental projects and facilities.

Transportation is an important part of the firm’s business. Large infrastructure projects can involve roads, transit systems and other facilities that require engineering and planning at several stages.

AECOM also works on environmental projects and large facilities. Its combination of engineering, consulting and project work allows it to operate across different parts of the infrastructure market.

The company has a large presence in the USA and works on major projects in several sectors.

Unique Offerings

● Transportation engineering
● Infrastructure consulting
● Environmental services
● Facilities projects
● Large-scale project delivery

Official website: AECOM

3. Tetra Tech

Headquarters: Pasadena, CA
Main Business: Water, environmental and sustainable infrastructure

Tetra Tech focuses heavily on water and environmental engineering. It also provides consulting and engineering services for infrastructure projects.

Water is one of the firm’s main areas of work. This can include projects connected with water resources, treatment and wider environmental requirements.

The company also works on sustainable infrastructure. Its projects bring together engineering and environmental considerations rather than treating them as separate areas.

That focus gives Tetra Tech a different position from firms that are more heavily involved in transportation or construction.

Unique Offerings

● Water engineering
● Environmental services
● Infrastructure consulting
● Sustainable infrastructure
● Technical consulting

Official website: Tetra Tech

4. WSP USA

Headquarters: New York, NY
Main Business: Engineering, design and strategic advisory

WSP USA provides engineering, design and advisory services across transportation, property and buildings.

Transportation is one of its main areas, while its work also extends to buildings and property-related projects. The firm therefore works across both infrastructure and the built environment.

Its services include strategic advisory as well as engineering and design. This means the company can be involved before construction begins as well as during the design and development stages.

WSP’s broad practice has made it one of the major engineering firms operating in the US market.

Unique Offerings

● Transportation engineering
● Building design
● Property services
● Strategic advisory
● Infrastructure work

Official website: WSP USA

5. Fluor Corporation

Headquarters: Irving, TX
Main Business: Engineering, procurement and construction

Fluor Corporation is a major engineering, procurement and construction company, commonly known as an EPC firm.

Its work includes energy, chemicals and government projects. Unlike firms that mainly provide design and consulting services, Fluor is also involved in procurement and construction as part of project delivery.

The company handles large and technically demanding projects. Its work in energy and chemicals puts it in an important part of the industrial engineering market.

Government work is another area listed among its major markets.

Unique Offerings

● Engineering
● Procurement
● Construction
● Energy projects
● Chemical and government projects

Official website: Fluor Corporation

6. HDR

Headquarters: Omaha, NE
Main Business: Architecture, engineering and consulting

HDR combines engineering with architecture and consulting. Its work covers resource, transportation and health sectors.

Transportation projects form one part of its business, while healthcare and resource-related work add other areas. The firm therefore works across infrastructure as well as specialised facilities.

The combination of architecture, engineering and consulting is useful on projects where several professional disciplines need to work together.

HDR is also active in complex projects where technical requirements are an important part of the design.

Unique Offerings

● Engineering services
● Architecture
● Transportation projects
● Healthcare work
● Resource-related projects

Official website: HDR

7. Burns & McDonnell

Headquarters: Kansas City, MO
Main Business: Engineering, construction and architecture

Burns & McDonnell provides engineering, construction and architectural services. The company is 100% employee-owned, which is one of its distinguishing features.

Its work focuses on critical infrastructure and other large projects. The firm combines design and engineering with construction services instead of limiting its role to design.

This approach gives Burns & McDonnell a place across several stages of project development. Engineering and construction can be handled within the same organisation.

The company is based in Kansas City and has grown into a major US engineering firm.

Unique Offerings

● Engineering
● Construction
● Architecture
● Critical infrastructure
● Employee-owned business model

Official website: Burns & McDonnell

8. Kimley-Horn

Headquarters: Raleigh, NC
Main Business: Civil and transportation engineering

Kimley-Horn is known for civil and transportation engineering. Its work is closely connected with the planning and design of infrastructure used by communities and transport networks.

Transportation is a major part of the firm’s practice. Civil engineering forms another important area, covering the infrastructure needed for development and public projects.

Unlike firms with large energy or industrial practices, Kimley-Horn has a more focused position in civil and transportation engineering.

That specialisation has helped make it one of the major engineering design firms in the USA.

Unique Offerings

● Civil engineering
● Transportation engineering
● Infrastructure design
● Engineering consulting
● Transportation planning

Official website: Kimley-Horn

9. Stantec

Headquarters: Irvine, CA
Main Business: Community development, infrastructure and environmental services

Stantec is a multidisciplinary engineering and design firm working across infrastructure, community development and environmental projects.

Its work covers more than individual engineering projects. Community development involves planning and designing places where people live, work and use public services.

Environmental restoration is another area associated with the firm. This gives Stantec a role in projects where development and environmental requirements have to be considered together.

The company’s multidisciplinary approach allows it to work across several parts of the built and natural environment.

Unique Offerings

● Infrastructure
● Community development
● Environmental restoration
● Engineering and design
● Multidisciplinary project work

Official website: Stantec

10. HNTB Cos.

Headquarters: Kansas City, MO
Main Business: Transportation and infrastructure engineering

HNTB is one of the older names in the US engineering industry. The firm is particularly known for transportation and infrastructure work.

Highways, bridges and transit systems are major areas of its business. These projects require detailed engineering as well as long-term planning because they form part of wider transportation networks.

HNTB’s work is heavily connected with public infrastructure. Its projects can involve individual structures as well as larger transportation systems.

The firm rounds out this list with a strong focus on national infrastructure and transportation engineering.

Unique Offerings

● Highway engineering
● Bridge design
● Transit systems
● Transportation infrastructure
● Large public projects

Official website: HNTB Cos.

Why Engineering Firms Are Important in the USA

Transportation Is a Major Part of the Market

Transportation appears repeatedly across the firms on this list. AECOM, WSP USA, HDR, Kimley-Horn and HNTB all have significant transportation-related work.

Roads, bridges and transit systems require engineering at several stages. The work can include planning, design, environmental assessment and technical support during construction.

Water and Environmental Work Continue to Grow

Water and environmental engineering are important areas for firms such as Jacobs and Tetra Tech. Stantec also works in environmental restoration and community development.

These projects are different from conventional building work. Engineers may have to deal with water resources, environmental conditions and long-term effects on surrounding communities.

Large Projects Need More Than One Discipline

Several firms in the ranking combine engineering with other services. HDR provides architecture and consulting alongside engineering, while Burns & McDonnell combines engineering, construction and architecture.

Large infrastructure projects often involve several types of work at once. Having different disciplines within one firm can make it easier to manage those requirements.

Engineering Is Closely Linked to Infrastructure

Much of the work handled by these companies involves infrastructure. This includes roads, bridges, water systems, transit networks, facilities and industrial projects.

That makes engineering firms an important part of how major projects are planned and built in the USA.

Conclusion

The US engineering market includes firms with very different areas of expertise. Jacobs and AECOM work across large infrastructure projects, while Tetra Tech has a strong focus on water and environmental work. WSP USA, HDR and Stantec have broader multidisciplinary practices.

Other firms have more specialised positions. Fluor focuses heavily on engineering, procurement and construction, Kimley-Horn is known for civil and transportation engineering, and HNTB has a long history in highways, bridges and transit.

Together, these firms cover many of the engineering services needed for major infrastructure, transportation, environmental and industrial projects across the USA.

FAQs

Which is the largest engineering firm in the USA?

Jacobs Solutions Inc. ranks first in the list provided, based on the latest design and engineering rankings referenced in the source material.

What does AECOM specialise in?

AECOM is known for infrastructure consulting, transportation, environmental work and facilities projects.

Which engineering firm specialises in water and environmental work?

Tetra Tech has a strong focus on water, environmental services and sustainable infrastructure.

What does Fluor Corporation do?

Fluor provides engineering, procurement and construction services. Its major markets include energy, chemicals and government projects.

Which engineering firm is known for civil engineering?

Kimley-Horn is particularly known for civil and transportation engineering.

Which engineering firms work on transportation projects?

AECOM, WSP USA, HDR, Kimley-Horn and HNTB all have transportation work among their major areas.

Is Burns & McDonnell employee-owned?

Yes. Burns & McDonnell is described in the supplied source material as a 100% employee-owned firm.