Company lists · Data refreshed September 2026

Top 25 Geological survey organizations based in the United States

Name: Geological survey organizations 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 530 companies tracked

RevenueBase identified 530 geological survey organizations headquartered in the United States as of September 2026 and tracks 7,167 professional contacts across them, including 2,338 with verified work emails. Houston is the largest hub.

This list covers geological survey organizations 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

530Companies

7,167Contacts tracked

2,338Verified emails

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The 25 largest geological survey organizations based in the United States

Ranked by team size

Top 25 of 530 geological survey organizations 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 geological survey organizations: 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	Saexploration	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	521 contacts →
	Indirect evidence “SAExploration offers a full range of geophysical ground acquisition services from design, prospecting, drilling, recording and analysis of field quality, as well as mobilization…” Source: RevenueBase Database · checked Sep 19, 2026
2	Global Geophysical Services	Indirect evidence	Missouri City, TX, United StatesHQ checked Sep 19, 2026	201-500	396 contacts →
	Indirect evidence “GGS provides an integrated suite of Geoscience solutions to the global oil and gas industry including high-resolution RG-3D Reservoir Grade® seismic data acquisition, Multi Client…” Source: RevenueBase Database · checked Sep 19, 2026
3	Topographic, CO	Partial evidence	Benbrook, TX, United StatesHQ checked Sep 19, 2026	201-500	335 contacts →
	Partial evidence “What began as a small company in the oilfields of Southern Oklahoma, today Topographic Land Surveyors stands as the industry leader in the fields of Surveying, Mapping…” Source: RevenueBase Database · checked Sep 19, 2026
4	Encompass Energy Services, LLC	Partial evidence	The Woodlands, TX, United StatesHQ checked Sep 19, 2026	501-1,000	298 contacts →
	Partial evidence “Encompass Services is a professional Survey, Land/ROW, and GIS firm serving the energy, land management, transportation, and infrastructure industries.” Source: RevenueBase Database · checked Sep 19, 2026
5	Degolyer And Macnaughton	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 19, 2026	201-500	268 contacts →
	Indirect evidence “Reserves assessments and appraisals • Prospective resources assessments • Unconventional resources assessments • Contingent resources assessments • Reservoir simulation •…” Source: RevenueBase Database · checked Sep 19, 2026
6	Converse Consultants	Indirect evidence	Monrovia, CA, United StatesHQ checked Sep 19, 2026	51-200	132 contacts →
	Indirect evidence “Converse was established in 1946 by Professor Frederick J.” Source: RevenueBase Database · checked Sep 19, 2026
7	Microseismic, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	79 contacts →
	Indirect evidence “Specialist in Real-Time Completions Intelligence for Fracture Geometry & Efficiency \| Geohazards \| Stress Field \| CCUS \| Geothermal \| FDI \| Sinkhole Detection \| Induced Seismicity…” Source: RevenueBase Database · checked Sep 19, 2026
8	Rangefront Mining Services	Indirect evidence	Elko, NV, United StatesHQ checked Sep 19, 2026	51-200	79 contacts →
	Indirect evidence “Rangefront exists to serve your mining or exploration project in the most efficient, advanced, and forward-thinking way.” Source: RevenueBase Database · checked Sep 19, 2026
9	Collier Consulting & Collier Geophysics	Indirect evidence	Stephenville, TX, United StatesHQ checked Sep 19, 2026	51-200	71 contacts →
	Indirect evidence “Geoscience • Engineering • Geophysics Collier Consulting, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
10	Zonge International	Indirect evidence	Reno, NV, United StatesHQ checked Sep 19, 2026	51-200	64 contacts →
	Indirect evidence “Minerals / Geothermal / Groundwater / Petroleum / Environmental / Infrastructure Are you concerned about ensuring every opportunity for success for your project and stakeholders?” Source: RevenueBase Database · checked Sep 19, 2026
11	Terra Guidance, LLC	Partial evidence	Englewood, CO, United StatesHQ checked Sep 19, 2026	51-200	59 contacts →
	Partial evidence “Terra Guidance provides geological analysis remotely, onsite, and in-house.” Source: RevenueBase Database · checked Sep 19, 2026
12	Paragon Geophysical Services, INC	Indirect evidence	Wichita, KS, United StatesHQ checked Sep 19, 2026	51-200	59 contacts →
	Indirect evidence “Headquartered in Wichita, Kansas, and founded in 1993, Paragon Geophysical Services, Inc.” Source: RevenueBase Database · checked Sep 19, 2026
13	Alpine Ocean Seismic Survey, INC	Indirect evidence	Norwood, NJ, United StatesHQ checked Sep 19, 2026	51-200	55 contacts →
	Indirect evidence “Alpine are experts in acquiring, analyzing, and interpreting data from marine offshore, nearshore, and freshwater environments.” Source: RevenueBase Database · checked Sep 19, 2026
14	Geometrics INC	Indirect evidence	San Jose, CA, United StatesHQ checked Sep 19, 2026	51-200	52 contacts →
	Indirect evidence “Empowering geoscientists everywhere to explore and quantify the world since 1969.” Source: RevenueBase Database · checked Sep 19, 2026
15	Call & Nicholas	Partial evidence	Tucson, AZ, United StatesHQ checked Sep 19, 2026	51-200	52 contacts →
	Partial evidence “CALL & NICHOLAS (CNI) is an international mining consulting firm that specializes in geological engineering, geotechnical engineering, and hydrogeology.” Source: RevenueBase Database · checked Sep 19, 2026
16	Associated Earth Sciences, Inc. Aesi	Partial evidence	Kirkland, WA, United StatesHQ checked Sep 19, 2026	51-200	50 contacts →
	Partial evidence “In the early 1980s, geologist Louis Lepp had a vision to start a local geologic/geotechnical engineering consulting company by combining and coordinating several of the…” Source: RevenueBase Database · checked Sep 19, 2026
17	Field GEO Services, INC	Indirect evidence	Grand Junction, CO, United StatesHQ checked Sep 19, 2026	51-200	47 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
18	American Geosciences Institute	Indirect evidence	Alexandria, VA, United StatesHQ checked Sep 19, 2026	51-200	43 contacts →
	Indirect evidence “The American Geosciences Institute (AGI) is a nonprofit federation of 52 scientific and professional associations that represents more than geoscientists.” Source: RevenueBase Database · checked Sep 19, 2026
19	RGH Consultants	Indirect evidence	Santa Rosa, CA, United StatesHQ checked Sep 19, 2026	11-50	39 contacts →
	Indirect evidence “RGH Consultants was founded in 1991 as a full service firm with expertise in geotechnical engineering, engineering geology, and construction observation and testing.” Source: RevenueBase Database · checked Sep 19, 2026
20	Terrasond - Utec	Partial evidence	Palmer, AK, United StatesHQ checked Sep 19, 2026	51-200	38 contacts →
	Partial evidence “Provider of professional surveying services throughout the world safely, effectively, and economically.” Source: RevenueBase Database · checked Sep 19, 2026
21	Sauls Seismic	Indirect evidence	Birmingham, AL, United StatesHQ checked Sep 19, 2026	11-50	37 contacts →
	Indirect evidence “Sauls Seismic has been in the monitoring business for over four decades.” Source: RevenueBase Database · checked Sep 19, 2026
22	Oars Group	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	37 contacts →
	Partial evidence “Marine geoscience consulting group specializing in survey project consulting, data management, and the provision of experienced field personnel in support of offshore energy…” Source: RevenueBase Database · checked Sep 19, 2026
23	BIG Rock Exploration	Partial evidence	Stillwater, MN, United StatesHQ checked Sep 19, 2026	11-50	36 contacts →
	Partial evidence “Big Rock Exploration, LLC (BRE) specializes in mineral and mining exploration offering clients experience in project management, resource targeting, asset development and geologic…” Source: RevenueBase Database · checked Sep 19, 2026
24	Geostrata	Indirect evidence	Bluffdale, UT, United StatesHQ checked Sep 19, 2026	11-50	34 contacts →
	Indirect evidence “GeoStrata was established in by Mr.” Source: RevenueBase Database · checked Sep 19, 2026
25	Ocean Surveys, INC	Partial evidence	Old Saybrook, CT, United StatesHQ checked Sep 19, 2026	11-50	34 contacts →
	Partial evidence “OSI is a highly responsive hydrographic, geophysical, physical oceanographic surveying and sediment sampling firm staffed with scientists, hydrographers, engineers, and…” 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: geological survey organizations. 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 geological survey organizations.
Partial evidence: Its own public description names part of geological survey organizations, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name geological survey organizations. 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 530 geological survey organizations based in the United States

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Geological survey organizations based in the United States at a glance

As of Sep 19, 2026

32.6%Verified-email coverage

13.5Average contacts per company

1-10Median size (employees)

7.0%Largest-city concentration · Houston

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

279

11-50

173

51-200

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 530 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 geological survey organizations, 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 “geological survey organizations”. 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 geological survey organizations), 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 geological survey organizations, 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, 2,338 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.

Geological survey organizations by metro

Geological survey organizations in Houston37

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 geological survey organizations, 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 geological survey organizations are there based in the United States?

RevenueBase identified 530 geological survey organizations 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?

Saexploration, headquartered in Houston, tops this list with the largest team on record.

Which city has the most geological survey organizations?

Houston leads with 37 headquartered companies, followed by Denver (13) and Salt Lake City (7).

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 2,338 verified decision-maker contacts tracked across these 530 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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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.