Company lists · Data refreshed September 2026

Top 25 Transportation consultants based in the United States

RevenueBase identified 8,030 transportation consultants headquartered in the United States as of September 2026 and tracks 579,963 professional contacts across them, including 250,608 with verified work emails. Houston is the largest hub.

This list covers transportation consultants headquartered in the United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 21, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 21, 2026 86% judged on-target in blind review
8,030Companies
579,963Contacts tracked
250,608Verified emails
Explore this list → Free signup · no credit card · 500 free credits

The 25 largest transportation consultants based in the United States

Ranked by team size
Top 25 of 8,030 transportation consultants based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to transportation consultants: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Indirect evidenceDallas, TX, United StatesHQ checked Sep 21, 202610001+63,914 contacts →

Indirect evidence

“AECOM is the global infrastructure leader, committed to delivering a better world.”

Source: RevenueBase Database · checked Sep 21, 2026
2Indirect evidenceDallas, TX, United StatesHQ checked Sep 21, 202610001+46,351 contacts →

Indirect evidence

“At Jacobs, we're challenging today to reinvent tomorrow – delivering outcomes and solutions for the world's most complex challenges.”

Source: RevenueBase Database · checked Sep 21, 2026
3Indirect evidencePasadena, CA, United StatesHQ checked Sep 21, 202610001+12,999 contacts →

Indirect evidence

“Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end technical and engineering services for projects worldwide.”

Source: RevenueBase Database · checked Sep 21, 2026
4Indirect evidenceOverland Park, KS, United StatesHQ checked Sep 21, 202610001+10,851 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 21, 2026
5Indirect evidenceRaleigh, NC, United StatesHQ checked Sep 21, 20265,001-10,00010,117 contacts →

Indirect evidence

“Kimley-Horn is one of the nation’s premier planning and design consulting firms.”

Source: RevenueBase Database · checked Sep 21, 2026
6Indirect evidenceNew York, NY, United StatesHQ checked Sep 21, 202610001+9,318 contacts →

Indirect evidence

“What if you could shape built and natural environments – and the future of those that use them?”

Source: RevenueBase Database · checked Sep 21, 2026
7Indirect evidenceSan Francisco, CA, United StatesHQ checked Sep 21, 202610001+7,706 contacts →

Indirect evidence

“URS Corporation operations are now affiliated with AECOM.”

Source: RevenueBase Database · checked Sep 21, 2026
8Partial evidenceBoston, MA, United StatesHQ checked Sep 21, 20265,001-10,0007,527 contacts →

Partial evidence

“CDM Smith is shaping what’s next, now, with world class solutions in water, environment, transportation and energy to public and private clients worldwide.”

Source: RevenueBase Database · checked Sep 21, 2026
9Indirect evidenceKansas City, MO, United StatesHQ checked Sep 21, 20265,001-10,0007,469 contacts →

Indirect evidence

“For over a century, HNTB has shaped the built environment with distinctive expertise across a full spectrum of infrastructure solutions.”

Source: RevenueBase Database · checked Sep 21, 2026
10Indirect evidenceWindsor, CT, United StatesHQ checked Sep 21, 20265,001-10,0007,017 contacts →

Indirect evidence

“TRC, a member of WSP, stands for adaptability.”

Source: RevenueBase Database · checked Sep 21, 2026
11Indirect evidenceOlathe, KS, United StatesHQ checked Sep 21, 20265,001-10,0006,113 contacts →

Indirect evidence

“Terracon is a 100 percent employee-owned consulting engineering firm providing quality services to clients.”

Source: RevenueBase Database · checked Sep 21, 2026
12Indirect evidencePittsburgh, PA, United StatesHQ checked Sep 21, 20265,001-10,0004,362 contacts →

Indirect evidence

“Michael Baker International is a leading provider of engineering, consulting, and technology services spanning four Verticals: Infrastructure, Places and Facilities, Federal and…”

Source: RevenueBase Database · checked Sep 21, 2026
13Indirect evidenceNew York, NY, United StatesHQ checked Sep 21, 20261,001-5,0003,556 contacts →

Indirect evidence

“STV offers professional services for the infrastructure that powers our lives.”

Source: RevenueBase Database · checked Sep 21, 2026
14Indirect evidenceSan Francisco, CA, United StatesHQ checked Sep 21, 20261,001-5,0003,067 contacts →

Indirect evidence

“As a global engineering firm, we design infrastructure solutions that connect and elevate communities.”

Source: RevenueBase Database · checked Sep 21, 2026
15Indirect evidenceFairfax, VA, United StatesHQ checked Sep 21, 20261,001-5,0002,795 contacts →

Indirect evidence

“Dewberry is a leading, market-facing firm with a proven history of providing professional services to a wide variety of public- and private-sector clients.”

Source: RevenueBase Database · checked Sep 21, 2026
16Indirect evidenceLombard, IL, United StatesHQ checked Sep 21, 202610001+2,611 contacts →

Indirect evidence

“First Transit was acquired in 2023 and is now Transdev.”

Source: RevenueBase Database · checked Sep 21, 2026
17Indirect evidenceWalnut Creek, CA, United StatesHQ checked Sep 21, 20261,001-5,0002,473 contacts →

Indirect evidence

“Headquartered in Walnut Creek, Calif, Brown and Caldwell is an employee-owned firm with 2,100+ professionals serving clients locally and globally from 52 locations.”

Source: RevenueBase Database · checked Sep 21, 2026
18Indirect evidenceBoca Raton, FL, United StatesHQ checked Sep 21, 20261,001-5,0002,393 contacts →

Indirect evidence

“Geosyntec is a consulting and engineering firm that works with private and public sector clients to address new ventures and complex problems involving our environment, natural…”

Source: RevenueBase Database · checked Sep 21, 2026
19Indirect evidenceSan Diego, CA, United StatesHQ checked Sep 21, 20261,001-5,0002,344 contacts →

Indirect evidence

“At Kleinfelder, we have been connecting great people to the best work since 1961.”

Source: RevenueBase Database · checked Sep 21, 2026
20Indirect evidenceWatertown, MA, United StatesHQ checked Sep 21, 20261,001-5,0002,277 contacts →

Indirect evidence

“We are VHB.”

Source: RevenueBase Database · checked Sep 21, 2026
21Indirect evidenceBaton Rouge, LA, United StatesHQ checked Sep 21, 2026n/a2,232 contacts →

Indirect evidence

“Providence is an employee-owned engineering and environmental consulting firm.”

Source: RevenueBase Database · checked Sep 21, 2026
22Indirect evidenceChantilly, VA, United StatesHQ checked Sep 21, 20261,001-5,0002,210 contacts →

Indirect evidence

“ECS Group of Companies is a Chantilly, VA-based consulting engineering firm.”

Source: RevenueBase Database · checked Sep 21, 2026
23Indirect evidenceSparks, NC, United StatesHQ checked Sep 21, 20261,001-5,0002,207 contacts →

Indirect evidence

“KCI is a 100-percent employee-owned engineering, consulting and construction firm serving clients throughout the United States and beyond.”

Source: RevenueBase Database · checked Sep 21, 2026
24Indirect evidenceParsippany, NJ, United StatesHQ checked Sep 21, 20261,001-5,0002,177 contacts →

Indirect evidence

“Langan's client-focused, highly entrepreneurial culture cultivates an environment of opportunities in which career growth and teamwork flourish.”

Source: RevenueBase Database · checked Sep 21, 2026
25Partial evidenceMoon Township, PA, United StatesHQ checked Sep 21, 20261,001-5,0002,145 contacts →

Partial evidence

“Civil & Environmental Consultants, Inc.(CEC) provides comprehensive market-oriented consulting services that advance the strategic business objectives of its clients.”

Source: RevenueBase Database · checked Sep 21, 2026

Showing 25 of 8,030 transportation consultants based in the United States

See the full list, filter by size, metro and specialty, and get verified emails and direct dials for all 250,608 reachable decision-makers.

Free signup · no credit card

View the full list →

Transportation consultants based in the United States at a glance

As of Sep 21, 2026
43.2%Verified-email coverage
72.2Average contacts per company
11-50Median size (employees)
2.6%Largest-city concentration · Houston
Sep 21, 2026Page data refreshed

Companies by employee count

1-10
3,508
11-50
2,752
51-200
1,165
201-500
308
501-1,000
117
1,001-5,000
118
5,001-10,000
19
10001+
28

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 8,030 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among transportation consultants, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source
The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies
Companies headquartered in the United States whose own description of what they do matches “transportation consultants”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search
RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names transportation consultants), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude
Companies whose own description does not clearly place them among transportation consultants, and records with no verified work email. Companies headquartered outside United States are excluded even when they keep an office there.
Match quality
In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking
Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification
Every listed company carries at least one verified work email, 250,608 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh
This page's figures were pulled from the company graph on September 21, 2026. Lists refresh periodically as the graph is re-checked.
Corrections
Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Transportation consultants by metro

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names transportation consultants, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many transportation consultants are there based in the United States?

RevenueBase identified 8,030 transportation consultants headquartered in the United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

AECOM, headquartered in Dallas, tops this list with the largest team on record.

Which city has the most transportation consultants?

Houston leads with 206 headquartered companies, followed by New York (163) and Chicago (117).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 250,608 verified decision-maker contacts tracked across these 8,030 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 21, 2026.

Ready to reach these companies? Verified emails and direct dials for all 8,030 transportation consultants based in the United States. Start with a free account, no credit card.

Download this list →

Related lists

About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.