Company lists · Data verified August 2026

Top 25 Carbon accounting firms based in the United States

Name: Carbon accounting 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 856 companies tracked

There are 856 carbon accounting firms headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 9,968 professional contacts across them, including 3,915 with verified work emails and 3,654 with mobile numbers. New York is the largest hub.

This list covers carbon accounting 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.

856Companies

9,968Contacts tracked

3,915Verified emails

3,654Mobile numbers

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The 25 largest carbon accounting firms based in the United States

Ranked by team size

Top 25 of 856 carbon accounting 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	Watershed	San Francisco, CA	201-500	537	96
2	TRIO	Mclean, VA	201-500	382	245
3	Cascade Energy	Burlington, VT	201-500	290	194
4	PEG	Fairfax, VA	201-500	211	68
5	Carbon Direct	New York City	51-200	171	117
6	Keramida INC	Chicago, IL	51-200	150	104
7	Quest Resource Management Group, A Qrhc Company Nasdaq Qrhc	The Colony, TX	51-200	149	96
8	STOK	Solana Beach, CA	51-200	140	84
9	RE Tech Advisors	Dallas, TX	51-200	123	104
10	Michaels Energy- An Inc. 5000 Company	La Crosse, WI	51-200	120	7
11	Cascadia Consulting Group	Oakland, CA	51-200	108	74
12	Ecoengineers	Des Moines, IA	51-200	108	72
13	Techlaw	Chantilly, VA	201-500	106	37
14	Citadel EHS	Valencia, CA	51-200	102	77
15	AKT Peerless	Cheshire, CT	51-200	95	72
16	Climeco	Houston, TX	51-200	93	58
17	Verdani Partners	Carlsbad, CA	51-200	86	73
18	cemasys.com	Boston, MA	51-200	86	52
19	Codegreen	New York, NY	51-200	71	43
20	Ecoact Part Of Schneider Electric	New York, NY	201-500	70	19
21	Baumann Consulting	Chicago, IL	51-200	63	40
22	Brightworks Sustainability	Portland, OR	51-200	60	49
23	Wasteology	Louisville, KY	51-200	60	39
24	Greenplaces	Raleigh, NC	51-200	58	36
25	Partner Energy	Los Angeles, CA	51-200	56	41

Showing 25 of 856 carbon accounting firms based in the United States

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Carbon accounting firms based in the United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

New YorkLargest hub · 59 HQs

3,654Contacts with mobile numbers

29Emails re-verified in last 30 days

Companies by employee count

1-10

611

11-50

179

51-200

201-500

501-1,000

1,001-5,000

Carbon accounting firms by metro

Metro	Companies
Carbon accounting firms in New York	59
Carbon accounting firms in Houston	28
Carbon accounting firms in Chicago	25
Carbon accounting firms in Los Angeles	21
Carbon accounting firms in San Francisco	21
Carbon accounting firms in Seattle	19
Carbon accounting firms in Washington	17

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 “carbon accounting 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; 29 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 carbon accounting firms are there based in the United States?

There are 856 carbon accounting firms headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

Watershed, headquartered in San Francisco, tops this list with the largest team on record.

Which city has the most carbon accounting firms?

New York leads with 59 headquartered companies, followed by Houston (28) and Chicago (25).

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 3,915 verified decision-maker contacts tracked across these 856 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.