Company lists · Data refreshed September 2026

Top 25 Field analysis and consulting firms based in the United States

RevenueBase identified 4,435 field analysis and consulting firms headquartered in the United States as of September 2026 and tracks 120,092 professional contacts across them, including 59,470 with verified work emails. Houston is the largest hub.

This list covers field analysis and 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 28, 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 28, 2026 86% judged on-target in blind review
4,435Companies
120,092Contacts tracked
59,470Verified emails
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The 25 largest field analysis and consulting firms based in the United States

Ranked by team size
Top 25 of 4,435 field analysis and consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 28, 2026. RevenueBase Smart Search rates how each company's information relates to field analysis and 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Partial evidenceOlathe, KS, United StatesHQ checked Sep 28, 20265,001-10,0006,113 contacts →

Partial evidence

“Terracon is a 100 percent employee-owned consulting engineering firm providing quality services to clients.”

Source: RevenueBase Database · checked Sep 28, 2026
2Indirect evidenceHailey, ID, United StatesHQ checked Sep 28, 20261,001-5,0004,013 contacts →

Indirect evidence

“POWER Engineers is now part of WSP.”

Source: RevenueBase Database · checked Sep 28, 2026
3Partial evidenceChantilly, VA, United StatesHQ checked Sep 28, 20261,001-5,0002,210 contacts →

Partial evidence

“ECS Group of Companies is a Chantilly, VA-based consulting engineering firm.”

Source: RevenueBase Database · checked Sep 28, 2026
4Indirect evidenceHouston, TX, United StatesHQ checked Sep 28, 20261,001-5,0001,932 contacts →

Indirect evidence

“Employee-Owned.”

Source: RevenueBase Database · checked Sep 28, 2026
5Strong evidenceBoston, MA, United StatesHQ checked Sep 28, 20261,001-5,0001,781 contacts →

Strong 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 28, 2026
6Partial evidencePhoenix, AZ, United StatesHQ checked Sep 28, 20261,001-5,0001,629 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 28, 2026
7Partial evidenceHouston, TX, United StatesHQ checked Sep 28, 20261,001-5,0001,595 contacts →

Partial evidence

“alliant is the nation's premier consulting and management engineering firm.”

Source: RevenueBase Database · checked Sep 28, 2026
8Partial evidenceMenlo Park, CA, United StatesHQ checked Sep 28, 20261,001-5,0001,560 contacts →

Partial 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 28, 2026
9Partial evidenceDenver, CO, United StatesHQ checked Sep 28, 20261,001-5,0001,529 contacts →

Partial evidence

“Atlas Technical Consultants (Atlas) provides professional testing, inspection, engineering, environmental and consulting services nationwide.”

Source: RevenueBase Database · checked Sep 28, 2026
10Partial evidenceBoston, MA, United StatesHQ checked Sep 28, 20261,001-5,0001,479 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 28, 2026
11Strong evidenceKent, OH, United StatesHQ checked Sep 28, 20261,001-5,0001,395 contacts →

Strong evidence

“Davey Resource Group, Inc.(DRG) provides innovative consulting and field services that support utility infrastructure and environmental stewardship.”

Source: RevenueBase Database · checked Sep 28, 2026
12Indirect evidenceSan Francisco, CA, United StatesHQ checked Sep 28, 2026501-1,0001,248 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 28, 2026
13Partial evidenceDenver, CO, United StatesHQ checked Sep 28, 20261,001-5,0001,231 contacts →

Partial evidence

“Knight Piésold is an employee-owned, global consulting firm providing specialist services to the mining, power, water resources, and infrastructure industries.”

Source: RevenueBase Database · checked Sep 28, 2026
14Indirect evidenceHouston, TX, United StatesHQ checked Sep 28, 20261,001-5,0001,184 contacts →

Indirect evidence

“Consultants.”

Source: RevenueBase Database · checked Sep 28, 2026
15Indirect evidenceBurlington, MA, United StatesHQ checked Sep 28, 2026501-1,0001,124 contacts →

Indirect evidence

“Haley & Aldrich is committed to solving our clients’ most meaningful challenges in the built and natural environments.”

Source: RevenueBase Database · checked Sep 28, 2026
16Indirect evidenceHouston, TX, United StatesHQ checked Sep 28, 20261,001-5,0001,112 contacts →

Indirect evidence

“Ranked No.”

Source: RevenueBase Database · checked Sep 28, 2026
17Partial evidenceMinneapolis, MN, United StatesHQ checked Sep 28, 20261,001-5,0001,088 contacts →

Partial evidence

“Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.”

Source: RevenueBase Database · checked Sep 28, 2026
18Indirect evidenceDallas, TX, United StatesHQ checked Sep 28, 20261,001-5,000961 contacts →

Indirect evidence

“Trinity Consultants is a global team of experts helping organizations solve complex challenges in environmental compliance, ecological protection, infrastructure performance, and…”

Source: RevenueBase Database · checked Sep 28, 2026
19Indirect evidenceWaltham, MA, United StatesHQ checked Sep 28, 2026501-1,000942 contacts →

Indirect evidence

“Simpson Gumpertz & Heger (SGH) is a national engineering firm committed to delivering holistic advice for our clients’ most complex challenges.”

Source: RevenueBase Database · checked Sep 28, 2026
20Indirect evidenceNorthbrook, IL, United StatesHQ checked Sep 28, 2026501-1,000895 contacts →

Indirect evidence

“Founded in 1956, Wiss, Janney, Elstner Associates (WJE) is an interdisciplinary firm of engineers, architects, and materials scientists committed to helping clients solve, repair…”

Source: RevenueBase Database · checked Sep 28, 2026
21Indirect evidenceSeattle, WA, United StatesHQ checked Sep 28, 2026501-1,000859 contacts →

Indirect evidence

“The right team is more than an advantage.”

Source: RevenueBase Database · checked Sep 28, 2026
22Indirect evidenceAtlanta, GA, United StatesHQ checked Sep 28, 2026501-1,000849 contacts →

Indirect evidence

“Secretariat experts are trusted in the highest-stakes legal, risk, and regulatory matters around the world.”

Source: RevenueBase Database · checked Sep 28, 2026
23Strong evidenceWashington, DC, United StatesHQ checked Sep 28, 2026501-1,000791 contacts →

Strong evidence

“One of the world’s leading economic consulting firms, Compass Lexecon provides law firms, corporations and government clients with clear analysis of complex issues.”

Source: RevenueBase Database · checked Sep 28, 2026
24Indirect evidenceNew York, NY, United StatesHQ checked Sep 28, 2026501-1,000782 contacts →

Indirect evidence

“In 2026, NERA is celebrating 65 years of trusted economics, experts, and experience.”

Source: RevenueBase Database · checked Sep 28, 2026
25Indirect evidenceDe Pere, WI, United StatesHQ checked Sep 28, 2026501-1,000781 contacts →

Indirect evidence

“By combining science, engineering, and technology with a true collaborative spirit, Foth has delivered innovative solutions to our clients since 1938.”

Source: RevenueBase Database · checked Sep 28, 2026

Showing 25 of 4,435 field analysis and consulting firms based in the United States

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Field analysis and consulting firms based in the United States at a glance

As of Sep 28, 2026
49.5%Verified-email coverage
27.1Average contacts per company
1-10Median size (employees)
2.5%Largest-city concentration · Houston
Sep 28, 2026Page data refreshed

Companies by employee count

1-10
2,397
11-50
1,484
51-200
394
201-500
85
501-1,000
38
1,001-5,000
28
5,001-10,000
4
10001+
1

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 4,435 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 field analysis and 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 “field analysis and 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 field analysis and 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 field analysis and 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, 59,470 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 28, 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.

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 field analysis and 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 field analysis and consulting firms are there based in the United States?

RevenueBase identified 4,435 field analysis and 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 field analysis and consulting firms?

Houston leads with 109 headquartered companies, followed by New York (98) and Chicago (52).

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 59,470 verified decision-maker contacts tracked across these 4,435 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 28, 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.