Company lists · Data refreshed September 2026

Top 25 Transportation planning consulting firms based in the United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 1,536 companies tracked

RevenueBase identified 1,536 transportation planning consulting firms headquartered in the United States as of September 2026 and tracks 79,732 professional contacts across them, including 43,249 with verified work emails. New York is the largest hub.

This list covers transportation planning consulting firms 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

1,536Companies

79,732Contacts tracked

43,249Verified emails

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The 25 largest transportation planning consulting firms based in the United States

Ranked by team size

Top 25 of 1,536 transportation planning consulting firms 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 planning consulting firms: 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	Kimley-Horn	Strong evidence	Raleigh, NC, United StatesHQ checked Sep 21, 2026	5,001-10,000	10,117 contacts →
	Strong evidence “Kimley-Horn is one of the nation’s premier planning and design consulting firms.” Source: RevenueBase Database · checked Sep 21, 2026
2	Michael Baker International	Partial evidence	Pittsburgh, PA, United StatesHQ checked Sep 21, 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 21, 2026
3	STV	Indirect evidence	New York, NY, United StatesHQ checked Sep 21, 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 21, 2026
4	First Transit	Indirect evidence	Lombard, IL, United StatesHQ checked Sep 21, 2026	10001+	2,611 contacts →
	Indirect evidence “First Transit was acquired in 2023 and is now Transdev.” Source: RevenueBase Database · checked Sep 21, 2026
5	VHB	Indirect evidence	Watertown, MA, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,277 contacts →
	Indirect evidence “We are VHB.” Source: RevenueBase Database · checked Sep 21, 2026
6	Rk&k	Partial evidence	Baltimore, MD, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,641 contacts →
	Partial evidence “RK & K is a full-service planning, engineering, environmental, and construction management/inspection firm serving a wide range of clients throughout the United States.” Source: RevenueBase Database · checked Sep 21, 2026
7	Mead & Hunt	Partial evidence	Middleton, WI, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,355 contacts →
	Partial evidence “Mead & Hunt provides clients with expert planning, architecture design, engineering, environmental and construction administration services across a wide variety of market…” Source: RevenueBase Database · checked Sep 21, 2026
8	GPI Greenman-Pedersen, INC	Partial evidence	Melville, NY, United StatesHQ checked Sep 21, 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 21, 2026
9	Volkert, INC	Indirect evidence	Mobile, AL, United StatesHQ checked Sep 21, 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 21, 2026
10	WSB	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,053 contacts →
	Indirect evidence “Forge ahead.” Source: RevenueBase Database · checked Sep 21, 2026
11	David Evans And Associates, INC	Partial evidence	Portland, OR, United StatesHQ checked Sep 21, 2026	501-1,000	1,031 contacts →
	Partial evidence “Since its founding in 1976 in Portland, Oregon, DEA has become a recognized leader for progressive and sustainable design and management solutions for complex transportation, land…” Source: RevenueBase Database · checked Sep 21, 2026
12	GAI Consultants, INC	Strong evidence	Homestead, PA, United StatesHQ checked Sep 21, 2026	501-1,000	964 contacts →
	Strong 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 21, 2026
13	Parametrix	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 21, 2026	501-1,000	880 contacts →
	Indirect evidence “At Parametrix, we help our clients imagine what's possible.” Source: RevenueBase Database · checked Sep 21, 2026
14	Transystems	Partial evidence	Kansas City, MO, United StatesHQ checked Sep 21, 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 21, 2026
15	DUDEK	Strong evidence	Encinitas, CA, United StatesHQ checked Sep 21, 2026	501-1,000	795 contacts →
	Strong evidence “Dudek is an environmental, planning, and engineering consulting firm.” Source: RevenueBase Database · checked Sep 21, 2026
16	Psomas	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 21, 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 21, 2026
17	Quiddity	Strong evidence	Houston, TX, United StatesHQ checked Sep 21, 2026	501-1,000	683 contacts →
	Strong evidence “Quiddity is an award-winning, full-service civil engineering, planning, surveying, and consulting firm providing innovative solutions for public infrastructure and private…” Source: RevenueBase Database · checked Sep 21, 2026
18	Tighe & Bond	Strong evidence	Westfield, MA, United StatesHQ checked Sep 21, 2026	501-1,000	646 contacts →
	Strong evidence “Tighe & Bond is the Northeast’s leading engineering, environmental, planning, and design consulting firm.” Source: RevenueBase Database · checked Sep 21, 2026
19	MSA Professional Services	Partial evidence	Baraboo, WI, United StatesHQ checked Sep 21, 2026	501-1,000	602 contacts →
	Partial evidence “As a full-service consulting firm, MSA Professional Services (MSA) is all about creating communities that work.” Source: RevenueBase Database · checked Sep 21, 2026
20	Neel-Schaffer, INC	Partial evidence	Jackson, MS, United StatesHQ checked Sep 21, 2026	501-1,000	591 contacts →
	Partial evidence “Neel-Schaffer is a multi-disciplined engineering, planning and construction management firm that was founded in 1983 and today is one of the largest private, employee-owned…” Source: RevenueBase Database · checked Sep 21, 2026
21	BKF Engineers	Indirect evidence	Oakland, CA, United StatesHQ checked Sep 21, 2026	501-1,000	588 contacts →
	Indirect evidence “BKF is the premier A/E/C firm in the Western United States-built on over 110 years of excellence and a vision for the future.” Source: RevenueBase Database · checked Sep 21, 2026
22	Walker Consultants	Strong evidence	Hoffman Estates, IL, United StatesHQ checked Sep 21, 2026	201-500	540 contacts →
	Strong evidence “Walker Consultants provides planning, design, engineering, forensics, restoration and consulting for the built environment.” Source: RevenueBase Database · checked Sep 21, 2026
23	KLJ	Indirect evidence	Bismarck, ND, United StatesHQ checked Sep 21, 2026	501-1,000	539 contacts →
	Indirect evidence “Since the 1930s, KLJ has worked alongside communities and clients of all sizes, partnering with cities, counties, and developers – just to name a few.” Source: RevenueBase Database · checked Sep 21, 2026
24	Iteris, INC	Indirect evidence	Austin, TX, United StatesHQ checked Sep 21, 2026	201-500	530 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 21, 2026
25	BSC Group	Partial evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	51-200	504 contacts →
	Partial evidence “BSC Group, Inc.(BSC) is a multidisciplinary consulting firm with a staff of more than 200 professionals and offices in Boston, Worcester, Andover, and West Yarmouth, MA, as well…” Source: RevenueBase Database · checked Sep 21, 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 planning consulting firms. 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 planning consulting firms.
Partial evidence: Its own public description names part of transportation planning consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name transportation planning consulting firms. 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 1,536 transportation planning consulting firms based in the United States

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Transportation planning consulting firms based in the United States at a glance

As of Sep 21, 2026

54.2%Verified-email coverage

51.9Average contacts per company

1-10Median size (employees)

2.5%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

805

11-50

434

51-200

204

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 1,536 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 planning consulting firms, 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 planning consulting firms”. 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 planning consulting firms), 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 planning consulting firms, 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, 43,249 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 planning consulting firms 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 planning consulting firms, 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 planning consulting firms are there based in the United States?

RevenueBase identified 1,536 transportation planning consulting firms 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?

Kimley-Horn, headquartered in Raleigh, tops this list with the largest team on record.

Which city has the most transportation planning consulting firms?

New York leads with 38 headquartered companies, followed by Houston (31) and Dallas (29).

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 43,249 verified decision-maker contacts tracked across these 1,536 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.

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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.