Company lists · Data refreshed September 2026

Top 25 Transportation consulting companies based in the United States

Name: Transportation consulting companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 1,930 companies tracked

RevenueBase identified 1,930 transportation consulting companies headquartered in the United States as of September 2026 and tracks 163,669 professional contacts across them, including 55,909 with verified work emails. New York is the largest hub.

This list covers transportation consulting companies 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 19, 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 19, 2026 86% judged on-target in blind review

1,930Companies

163,669Contacts tracked

55,909Verified emails

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The 25 largest transportation consulting companies based in the United States

Ranked by team size

Top 25 of 1,930 transportation consulting companies based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to transportation consulting companies: 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.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	AECOM	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 19, 2026	10001+	63,914 contacts →
	Indirect evidence “AECOM is the global infrastructure leader, committed to delivering a better world.” Source: RevenueBase Database · checked Sep 19, 2026
2	Ch2m	Indirect evidence	Englewood, CO, United StatesHQ checked Sep 19, 2026	10001+	8,088 contacts →
	Indirect evidence “CH2M is now Jacobs.” Source: RevenueBase Database · checked Sep 19, 2026
3	URS Corporation, An Aecom Company	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	10001+	7,706 contacts →
	Indirect evidence “URS Corporation operations are now affiliated with AECOM.” Source: RevenueBase Database · checked Sep 19, 2026
4	Michael Baker International	Partial evidence	Pittsburgh, PA, United StatesHQ checked Sep 19, 2026	5,001-10,000	4,362 contacts →
	Partial 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 19, 2026
5	STV	Indirect evidence	New York, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	3,556 contacts →
	Indirect evidence “STV offers professional services for the infrastructure that powers our lives.” Source: RevenueBase Database · checked Sep 19, 2026
6	VHB	Indirect evidence	Watertown, MA, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,277 contacts →
	Indirect evidence “We are VHB.” Source: RevenueBase Database · checked Sep 19, 2026
7	Olsson	Indirect evidence	Lincoln, NE, United StatesHQ checked Sep 19, 2026	1,001-5,000	2,108 contacts →
	Indirect evidence “Olsson is an engineering firm made up of people who craft expert solutions and designs that improve communities.” Source: RevenueBase Database · checked Sep 19, 2026
8	GPI Greenman-Pedersen, INC	Partial evidence	Melville, NY, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,354 contacts →
	Partial evidence “With a staff of over 1,800 professionals, Greenman-Pedersen, Inc.(GPI) is a leading engineering consulting firm that specializes in the innovative design and construction of…” Source: RevenueBase Database · checked Sep 19, 2026
9	Volkert, INC	Indirect evidence	Mobile, AL, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,199 contacts →
	Indirect evidence “Volkert’s history began in 1925 when it was founded in New Orleans as Doullut & Erwin to provide waterfront and heavy construction services, as well as airport design services…” Source: RevenueBase Database · checked Sep 19, 2026
10	Moffatt & Nichol	Indirect evidence	Long Beach, CA, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,178 contacts →
	Indirect evidence “Moffatt & Nichol is a leading U.S-based global infrastructure advisor specializing in the planning and design of facilities that shape and serve our coastlines, harbors and…” Source: RevenueBase Database · checked Sep 19, 2026
11	GAI Consultants, INC	Partial evidence	Homestead, PA, United StatesHQ checked Sep 19, 2026	501-1,000	964 contacts →
	Partial evidence “Transforming ideas into reality® since 1958, GAI Consultants is an engineering, planning, and environmental consulting firm that provides customized solutions and local expertise…” Source: RevenueBase Database · checked Sep 19, 2026
12	Transystems	Partial evidence	Kansas City, MO, United StatesHQ checked Sep 19, 2026	1,001-5,000	850 contacts →
	Partial evidence “TranSystems plans, designs, and oversees construction to enhance the transportation networks and infrastructure that makes communities more livable today and in the future.” Source: RevenueBase Database · checked Sep 19, 2026
13	Hallcon Corporation	Partial evidence	Chicago, IL, United StatesHQ checked Sep 19, 2026	5,001-10,000	840 contacts →
	Partial evidence “Hallcon is a transportation and infrastructure services company focused on turnkey solutions for clients such as technology companies, manufacturers, railroads, universities…” Source: RevenueBase Database · checked Sep 19, 2026
14	DUDEK	Partial evidence	Encinitas, CA, United StatesHQ checked Sep 19, 2026	501-1,000	795 contacts →
	Partial evidence “Dudek is an environmental, planning, and engineering consulting firm.” Source: RevenueBase Database · checked Sep 19, 2026
15	Wade Trim	Indirect evidence	Detroit, MI, United StatesHQ checked Sep 19, 2026	501-1,000	758 contacts →
	Indirect evidence “At Wade Trim, we are committed to maximizing the value of your infrastructure investment.” Source: RevenueBase Database · checked Sep 19, 2026
16	Psomas	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 19, 2026	501-1,000	748 contacts →
	Indirect evidence “Our award-winning projects are produced through innovation, creativity, and technical expertise.” Source: RevenueBase Database · checked Sep 19, 2026
17	Iteris, INC	Indirect evidence	Austin, TX, United StatesHQ checked Sep 19, 2026	201-500	530 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
18	Cobb, Fendley & Associates, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	501-1,000	524 contacts →
	Indirect evidence “Cobb, Fendley & Associates, Inc.(CobbFendley) is a nationally recognized infrastructure solutions firm with a regional focus and a commitment to excellence.” Source: RevenueBase Database · checked Sep 19, 2026
19	Groendyke Transport	Partial evidence	Enid, OK, United StatesHQ checked Sep 19, 2026	1,001-5,000	506 contacts →
	Partial evidence “Groendyke Transport provides superior and dependable transportation services and bulk logistics solutions which consistently delivers value to leading companies who place a…” Source: RevenueBase Database · checked Sep 19, 2026
20	SRF Consulting Group	Strong evidence	Minneapolis, MN, United StatesHQ checked Sep 19, 2026	201-500	471 contacts →
	Strong evidence “SRF Consulting Group is a full-service consulting firm with a broad base of award-winning services, including- Transportation and Transit Planning - Community and Land Use…” Source: RevenueBase Database · checked Sep 19, 2026
21	Lockwood, Andrews & Newnam, Inc. LAN	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	461 contacts →
	Partial evidence “Lockwood, Andrews & Newnam, Inc.(LAN) is a full-service consulting firm offering planning, engineering and program management services.” Source: RevenueBase Database · checked Sep 19, 2026
22	Fehr & Peers	Partial evidence	Walnut Creek, CA, United StatesHQ checked Sep 19, 2026	201-500	448 contacts →
	Partial evidence “We are a transportation planning and engineering firm with 24 offices and over 400 staff nationwide.” Source: RevenueBase Database · checked Sep 19, 2026
23	Mccormick Taylor, INC	Indirect evidence	Philadelphia, PA, United StatesHQ checked Sep 19, 2026	201-500	434 contacts →
	Indirect evidence “McCormick Taylor is a full-service civil engineering firm providing creative design, planning, and environmental solutions to the challenges of everyday life.” Source: RevenueBase Database · checked Sep 19, 2026
24	Infrastructure Consulting & Engineering	Strong evidence	West Columbia, SC, United StatesHQ checked Sep 19, 2026	501-1,000	425 contacts →
	Strong evidence “Founded in 2005, Infrastructure Consulting & Engineering, LLC (ICE) provides transportation consulting and engineering services across the Southeast.” Source: RevenueBase Database · checked Sep 19, 2026
25	Mccollister's Global Services, INC	Partial evidence	Burlington, NJ, United StatesHQ checked Sep 19, 2026	501-1,000	425 contacts →
	Partial evidence “McCollister’s Transportation Group, Inc.” Source: RevenueBase Database · checked Sep 19, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: transportation consulting companies. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names transportation consulting companies.
Partial evidence: Its own public description names part of transportation consulting companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name transportation consulting companies. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 1,930 transportation consulting companies based in the United States

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Transportation consulting companies based in the United States at a glance

As of Sep 19, 2026

34.2%Verified-email coverage

84.8Average contacts per company

1-10Median size (employees)

2.6%Largest-city concentration · New York

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

1,069

11-50

514

51-200

226

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 1,930 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 consulting companies, 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 consulting companies”. 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 consulting companies), 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 consulting companies, 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, 55,909 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 19, 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 consulting companies 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 consulting companies, 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 consulting companies are there based in the United States?

RevenueBase identified 1,930 transportation consulting companies 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 consulting companies?

New York leads with 51 headquartered companies, followed by Houston (47) and Chicago (40).

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 55,909 verified decision-maker contacts tracked across these 1,930 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 19, 2026.

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Transportation consulting companies by geography

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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.