Company lists · Data verified August 2026

Top 25 Esg consulting firms based in the United States

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

Compiled by the RevenueBase Data Team Verified Aug 28, 2026 2,874 companies tracked

There are 2,874 esg consulting firms headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 47,277 professional contacts across them, including 20,646 with verified work emails and 18,134 with mobile numbers. New York is the largest hub.

This list covers esg 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. Data current as of August 28, 2026.

2,874Companies

47,277Contacts tracked

20,646Verified emails

18,134Mobile numbers

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The 25 largest esg consulting firms based in the United States

Ranked by team size

Top 25 of 2,874 esg consulting firms based in the United States, ranked by team size, largest first. Data verified Aug 28, 2026. Click a count to unlock that company's people.
#	Company	HQ	Employees	Contacts	Verified emails
1	APTIM	Wichita, KS	1,001-5,000	2,644	1,098
2	Baringa	New York, NY	1,001-5,000	2,198	1,548
3	Swca Environmental Consultants	Phoenix, AZ	1,001-5,000	1,618	1,159
4	Montrose Environmental Group	Little Rock, AR	1,001-5,000	1,516	846
5	Sphera	Chicago, IL	1,001-5,000	1,345	925
6	Apex Companies	Rockville, MD	1,001-5,000	1,146	591
7	Trinity Consultants	Dallas, TX	1,001-5,000	949	615
8	Inerco	Delaware	1,001-5,000	682	90
9	Antea Group USA	White Plains, NY	1,001-5,000	658	6
10	Solomonedwards	Wayne, PA	1,001-5,000	566	179
11	Watershed	San Francisco, CA	201-500	537	96
12	EBI Consulting	Springfield Township, PA	501-1,000	530	351
13	Rincon Consultants	San Diego, CA	501-1,000	483	312
14	Enhesa	Arlington, VA	201-500	463	370
15	Groundwater & Environmental Services, INC	Amherst, NY	201-500	452	229
16	ROUX	Houston, TX	201-500	435	311
17	SEDEX	Chicago, IL	201-500	420	178
18	TRIO	Mclean, VA	201-500	382	245
19	P2s	Irvine, CA	201-500	370	208
20	All4	Philadelphia, PA	201-500	330	237
21	Environmental Consulting & Technology, Inc. ECT	Tampa, FL	201-500	303	176
22	Cohnreznick LLP	New York, NY	5,001-10,000	288	190
23	Ecology And Environment, INC	Lancaster, NY	5,001-10,000	277	19
24	Kleinschmidt Associates	Pittsfield, ME	201-500	221	154
25	PEG	Fairfax, VA	201-500	211	68

Showing 25 of 2,874 esg consulting firms based in the United States

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Esg consulting firms based in the United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

New YorkLargest hub · 153 HQs

18,134Contacts with mobile numbers

0Emails re-verified in last 30 days

Companies by employee count

1-10

1,984

11-50

671

51-200

145

201-500

501-1,000

1,001-5,000

5,001-10,000

Esg consulting firms by metro

Metro	Companies
Esg consulting firms in New York	153
Esg consulting firms in Washington	80
Esg consulting firms in Houston	75
Esg consulting firms in Chicago	65
Esg consulting firms in San Francisco	59
Esg consulting firms in Los Angeles	54
Esg consulting firms in Seattle	49

How this list was built

Source: The RevenueBase company graph: 21.3 million companies and 398.9 million professional contacts resolved from primary sources.
Inclusion: Companies whose own business descriptions match “esg consulting firms”, with match quality audited by blind human judging, and headquartered in the United States.
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: Contact records re-verify on a rolling cadence; 0 contacts on this list were re-verified in the last 30 days.
Refresh: Lists are refreshed periodically as the underlying company graph is re-verified. Last verified Aug 28, 2026.

Frequently asked

How many esg consulting firms are there based in the United States?

There are 2,874 esg consulting firms headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

APTIM, headquartered in Wichita, tops this list with the largest team on record.

Which city has the most esg consulting firms?

New York leads with 153 headquartered companies, followed by Washington (80) and Houston (75).

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 20,646 verified decision-maker contacts tracked across these 2,874 companies.

How current is this list?

The list is refreshed periodically as the underlying company graph is re-verified. It was last verified on August 28, 2026.

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About this data

RevenueBase is a B2B contact data platform. Its company graph covers 21.3 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, the same data that powers RevenueBase's B2B data products and the free research portal.