Company lists · Data refreshed September 2026

Top 25 Scientific consulting firms based in the United States

Name: Scientific 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 14, 2026 6,591 companies tracked

RevenueBase identified 6,591 scientific consulting firms headquartered in the United States as of September 2026 and tracks 176,446 professional contacts across them, including 85,295 with verified work emails. Houston is the largest hub.

This list covers scientific 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 14, 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 14, 2026 86% judged on-target in blind review

6,591Companies

176,446Contacts tracked

85,295Verified emails

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The 25 largest scientific consulting firms based in the United States

Ranked by team size

Top 25 of 6,591 scientific consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to scientific 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	Terracon	Partial evidence	Olathe, KS, United StatesHQ checked Sep 14, 2026	5,001-10,000	6,113 contacts →
	Partial evidence “Terracon is a 100 percent employee-owned consulting engineering firm providing quality services to clients.” Source: RevenueBase Database · checked Sep 14, 2026
2	Power Engineers	Indirect evidence	Hailey, ID, United StatesHQ checked Sep 14, 2026	1,001-5,000	4,013 contacts →
	Indirect evidence “POWER Engineers is now part of WSP.” Source: RevenueBase Database · checked Sep 14, 2026
3	Premier Research	Partial evidence	Morrisville, NC, United StatesHQ checked Sep 14, 2026	1,001-5,000	2,584 contacts →
	Partial evidence “Premier Research International LLC (Premier) is a global leader in clinical research and consulting services with expertise in driving an efficient and effective path to market…” Source: RevenueBase Database · checked Sep 14, 2026
4	Geosyntec Consultants	Partial evidence	Boca Raton, FL, United StatesHQ checked Sep 14, 2026	1,001-5,000	2,393 contacts →
	Partial evidence “Geosyntec is a consulting and engineering firm that works with private and public sector clients to address new ventures and complex problems involving our environment, natural…” Source: RevenueBase Database · checked Sep 14, 2026
5	Pace Analytical Services	Indirect evidence	Minneapolis, MN, United StatesHQ checked Sep 14, 2026	1,001-5,000	2,228 contacts →
	Indirect evidence “Pace® Science and Technology Company makes the world a safer, healthier place.” Source: RevenueBase Database · checked Sep 14, 2026
6	ECS Group Of Companies	Partial evidence	Chantilly, VA, United StatesHQ checked Sep 14, 2026	1,001-5,000	2,210 contacts →
	Partial evidence “ECS Group of Companies is a Chantilly, VA-based consulting engineering firm.” Source: RevenueBase Database · checked Sep 14, 2026
7	Civil & Environmental Consultants, INC	Partial evidence	Moon Township, PA, United StatesHQ checked Sep 14, 2026	1,001-5,000	2,145 contacts →
	Partial evidence “Civil & Environmental Consultants, Inc.(CEC) provides comprehensive market-oriented consulting services that advance the strategic business objectives of its clients.” Source: RevenueBase Database · checked Sep 14, 2026
8	Hazen And Sawyer	Indirect evidence	New York, NY, United StatesHQ checked Sep 14, 2026	1,001-5,000	2,100 contacts →
	Indirect evidence “As Hazen marks 75 years, we celebrate a legacy of absolute commitment to our clients while delivering the best technical work available anywhere.” Source: RevenueBase Database · checked Sep 14, 2026
9	Propharma	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 14, 2026	1,001-5,000	2,079 contacts →
	Indirect evidence “At ProPharma, we help pharmaceutical, biotechnology, and medical device companies bring life-changing therapies to market.” Source: RevenueBase Database · checked Sep 14, 2026
10	LJA	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,932 contacts →
	Indirect evidence “Employee-Owned.” Source: RevenueBase Database · checked Sep 14, 2026
11	Analysis Group	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,781 contacts →
	Partial evidence “Analysis Group is one of the largest international economics consulting firms, with more than 1,500 professionals across 15 offices in North America, Europe, and Asia.” Source: RevenueBase Database · checked Sep 14, 2026
12	Eurofins Lancaster Laboratories	Indirect evidence	Lancaster, PA, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,638 contacts →
	Indirect evidence “Eurofins Lancaster Laboratories is one of the largest commercial contract laboratories in the world providing comprehensive laboratory services in the pharmaceutical…” Source: RevenueBase Database · checked Sep 14, 2026
13	Swca Environmental Consultants	Partial evidence	Phoenix, AZ, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,629 contacts →
	Partial evidence “Founded on a commitment to sound science and creative solutions, SWCA is a leader in environmental and management consulting services.” Source: RevenueBase Database · checked Sep 14, 2026
14	GEI Consultants, INC	Indirect evidence	Woburn, MA, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,604 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026
15	Alliantgroup	Partial evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,595 contacts →
	Partial evidence “alliant is the nation's premier consulting and management engineering firm.” Source: RevenueBase Database · checked Sep 14, 2026
16	UES	Indirect evidence	Orlando, FL, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,595 contacts →
	Indirect evidence “UES provides professional engineering, environmental, testing and inspection services to clients across the United States.” Source: RevenueBase Database · checked Sep 14, 2026
17	Trinity Life Sciences	Indirect evidence	Waltham, MA, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,566 contacts →
	Indirect evidence “Trinity is the commercialization intelligence partner for life sciences.” Source: RevenueBase Database · checked Sep 14, 2026
18	Exponent	Strong evidence	Menlo Park, CA, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,560 contacts →
	Strong evidence “In an era of accelerating change, Exponent is the only premium engineering and scientific consulting firm with the depth and breadth of expertise to solve our clients’ most…” Source: RevenueBase Database · checked Sep 14, 2026
19	ATLAS	Partial evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,529 contacts →
	Partial evidence “Atlas Technical Consultants (Atlas) provides professional testing, inspection, engineering, environmental and consulting services nationwide.” Source: RevenueBase Database · checked Sep 14, 2026
20	Charles River Associates	Partial evidence	Boston, MA, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,479 contacts →
	Partial evidence “Charles River Associates (CRA) is a global consulting firm specializing in litigation, regulatory, financial, and management consulting.” Source: RevenueBase Database · checked Sep 14, 2026
21	Davey Resource Group, INC	Partial evidence	Kent, OH, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,395 contacts →
	Partial evidence “Davey Resource Group, Inc.(DRG) provides innovative consulting and field services that support utility infrastructure and environmental stewardship.” Source: RevenueBase Database · checked Sep 14, 2026
22	Adec Innovations	Indirect evidence	Irvine, CA, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,304 contacts →
	Indirect evidence “ADEC Innovations seamlessly delivers fully integrated, cost-effective industry expertise, business process & data management, and software services.” Source: RevenueBase Database · checked Sep 14, 2026
23	Noblis	Partial evidence	Reston, VA, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,261 contacts →
	Partial evidence “Noblis is a nonprofit science, technology, and strategy organization that brings the best of scientific thought, management, and engineering expertise in an environment of…” Source: RevenueBase Database · checked Sep 14, 2026
24	Ardurra	Indirect evidence	Miami, FL, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,260 contacts →
	Indirect evidence “Expertly balancing experience and innovation to deliver unique solutions to public and private clients.” Source: RevenueBase Database · checked Sep 14, 2026
25	Cornerstone Research	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 14, 2026	501-1,000	1,248 contacts →
	Indirect evidence “At Cornerstone Research, we attribute our success to a unique combination of resources: a creative and energetic staff, cutting-edge technology and research, and our work with…” Source: RevenueBase Database · checked Sep 14, 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: scientific 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 scientific consulting firms.
Partial evidence: Its own public description names part of scientific consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name scientific 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 6,591 scientific consulting firms based in the United States

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Scientific consulting firms based in the United States at a glance

As of Sep 14, 2026

48.3%Verified-email coverage

26.8Average contacts per company

1-10Median size (employees)

2.8%Largest-city concentration · Houston

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

4,022

11-50

1,757

51-200

561

201-500

131

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 6,591 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 scientific 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 “scientific 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 scientific 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 scientific 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, 85,295 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 14, 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.

Scientific 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 scientific 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 scientific consulting firms are there based in the United States?

RevenueBase identified 6,591 scientific 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?

Terracon, headquartered in Olathe, tops this list with the largest team on record.

Which city has the most scientific consulting firms?

Houston leads with 182 headquartered companies, followed by New York (125) and San Diego (95).

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 85,295 verified decision-maker contacts tracked across these 6,591 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 14, 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.