Company lists · Data verified August 2026

Top 25 Coal geology consulting firms based in the United States

Name: Coal geology 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 545 companies tracked

There are 545 coal geology consulting firms headquartered in the United States (RevenueBase, August 2026). RevenueBase tracks 6,556 professional contacts across them, including 2,476 with verified work emails and 2,764 with mobile numbers. Houston is the largest hub.

This list covers coal geology 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.

545Companies

6,556Contacts tracked

2,476Verified emails

2,764Mobile numbers

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The 25 largest coal geology consulting firms based in the United States

Ranked by team size

Top 25 of 545 coal geology 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	Geo-Technology Associates, Inc. GTA	Laurel, MD	501-1,000	457	267
2	Hillis-Carnes Engineering Associates, INC	Frederick, MD	201-500	303	146
3	Degolyer And Macnaughton	Houston, TX	201-500	267	124
4	Piteau Associates Engineering	Tucson, AZ	51-200	139	79
5	Petrostrat	Houston, TX	51-200	137	105
6	G2 Consulting Group, LLC	Ann Arbor, MI	51-200	119	71
7	SDS Petroleum Consultants	Oklahoma City, OK	51-200	119	18
8	Geo-Logic Associates, INC	Riverside, CA	201-500	106	72
9	Blade Energy Partners	Houston, TX	51-200	102	58
10	Plaster & Wald Consulting Corp	Mustang, OK	201-500	91	8
11	Sdii Global	Tampa, FL	51-200	83	37
12	Rangefront Mining Services	Elko, NV	51-200	79	15
13	A. G. Wassenaar, INC	Englewood, CO	51-200	74	23
14	Terra Guidance, LLC	Englewood, CO	51-200	60	28
15	Giles Engineering Associates, INC	Orange, CA	51-200	57	30
16	Cornerstone Earth Group, INC	Sunnyvale, CA	51-200	56	43
17	Engineering Analytics, INC	Fort Collins, CO	201-500	56	35
18	Contour Engineering, LLC	Kennesaw, GA	51-200	56	27
19	Lonquist & Co., LLC	Austin, TX	51-200	54	44
20	Associated Earth Sciences, Inc. Aesi	Tacoma, WA	51-200	47	39
21	Riner Engineering, Inc., A UES Company	Austin, TX	51-200	47	22
22	Field GEO Services, INC	Grand Junction, CO	51-200	47	21
23	Geoservices, LLC	Cleveland, TN	51-200	40	26
24	KEY Environmental INC	Carnegie, PA	51-200	40	23
25	Earthres, A Division Of Respec	Morgantown, WV	51-200	38	23

Showing 25 of 545 coal geology consulting firms based in the United States

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Coal geology consulting firms based in the United States at a glance

As of Aug 28, 2026

1-10Median size (employees)

HoustonLargest hub · 48 HQs

2,764Contacts with mobile numbers

16Emails re-verified in last 30 days

Companies by employee count

1-10

315

11-50

159

51-200

201-500

501-1,000

1,001-5,000

Coal geology consulting firms by metro

Metro	Companies
Coal geology consulting firms in Houston	48
Coal geology consulting firms in Denver	16
Coal geology consulting firms in Oklahoma City	8
Coal geology consulting firms in Golden	8
Coal geology consulting firms in Reno	7
Coal geology consulting firms in Austin	7
Coal geology consulting firms in Salt Lake City	6
Coal geology consulting firms in Lakewood	6

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 “coal geology 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; 16 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 coal geology consulting firms are there based in the United States?

There are 545 coal geology consulting firms headquartered in the United States as of August 2026 (RevenueBase).

What is the largest company on this list?

Geo-Technology Associates, Inc. GTA, headquartered in Laurel, tops this list with the largest team on record.

Which city has the most coal geology consulting firms?

Houston leads with 48 headquartered companies, followed by Denver (16) and Oklahoma City (8).

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 2,476 verified decision-maker contacts tracked across these 545 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.