Company lists · Data refreshed September 2026

Top 25 Federal consulting firms based in the United States

Name: Federal 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 2, 2026 5,262 companies tracked

RevenueBase identified 5,262 federal consulting firms headquartered in the United States as of September 2026 and tracks 103,256 professional contacts across them, including 32,035 with verified work emails and 45,898 with mobile numbers. Washington is the largest hub.

This list covers federal 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, how directly it supports the match, and when it was last checked. Data refreshed September 2, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 Match evidence on every row Refreshed Sep 2, 2026 86% judged on-target in blind review

5,262Companies

103,256Contacts tracked

32,035Verified emails

45,898Mobile numbers

Unlock all 5,262 companies Free signup · no credit card · 500 free credits

The 25 largest federal consulting firms based in the United States

Ranked by team size

Top 25 of 5,262 federal consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 2, 2026. Evidence rates how directly each company's own description names federal consulting firms: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#	Company	Headquarters	Employees	Contacts
1	MantechIndirect evidence	Herndon, VA, United States	5,001-10,000	9,756
	“MANTECH is more than a technology company.” Source: company website · checked Sep 2, 2026
2	Public Consulting GroupPartial evidence	Boston, MA, United States	1,001-5,000	2,673
	“Public Consulting Group (PCG) is a leading public sector solutions implementation and operations improvement firm that partners with health, education, and human services agencies…” Source: company website · checked Sep 2, 2026
3	DCS CorpIndirect evidence	Alexandria, VA, United States	1,001-5,000	1,884
	“DCS delivers advanced technology and management solutions to Government agencies in the national security sector.” Source: company website · checked Sep 2, 2026
4	Davey Resource Group, INCIndirect evidence	Kent, OH, United States	1,001-5,000	1,407
	“We are officially known as Davey Resource Group Inc, but we are more likely to come up in conversation around a successful project we've completed for a client or a capability we…” Source: company website · checked Sep 2, 2026
5	ArdurraIndirect evidence	Flagstaff, AZ, United States	1,001-5,000	1,248
	“Expertly balancing experience and innovation to deliver unique solutions to public and private clients.” Source: company website · checked Sep 2, 2026
6	Odyssey SystemsIndirect evidence	Wakefield, MA, United States	1,001-5,000	898
	“Odyssey is a leading provider of outstanding management, analytical, and technical support services to both the government and private sectors.” Source: company website · checked Sep 2, 2026
7	Iron BOW TechnologiesIndirect evidence	Honolulu, HI, United States	501-1,000	882
	“We deliver mission success through next-generation solutions across government, healthcare, and commercial markets.” Source: company website · checked Sep 2, 2026
8	ERGPartial evidence	Atlanta, GA, United States	501-1,000	674
	“ERG is a multidisciplinary consulting firm offering a broad range of professional services.” Source: company website · checked Sep 2, 2026
9	Salient CrgtIndirect evidence	Fairfax, VA, United States	1,001-5,000	646
	“For over 20 years, Salient CRGT has upheld its mission to "empower our diverse, hard-working team to deliver high-value solutions that make positive impacts on missions and…” Source: company website · checked Sep 2, 2026
10	Abacus Technology CorporationIndirect evidence	Chevy Chase, MD, United States	501-1,000	626
	“Abacus Technology Corporation delivers leading edge, high quality assistance in response to complex technology challenges.” Source: company website · checked Sep 2, 2026
11	Planned Systems InternationalIndirect evidence	Valparaiso, FL, United States	1,001-5,000	608
	“Since 1988, PSI teams have provided our government customers with innovative, cost effective solutions that solve today’s complex challenges, improve operational efficiencies, and…” Source: company website · checked Sep 2, 2026
12	SolomonedwardsIndirect evidence	Wayne, PA, United States	1,001-5,000	566
	“For more than 25 years, SolomonEdwards has empowered organizations to tackle common and complex business challenges through strategic advisory, technical advocacy, and hands-on…” Source: company website · checked Sep 2, 2026
13	Vencore INCIndirect evidence	Chantilly, VA, United States	1,001-5,000	486
	“As of June 1, 2018, we are Perspecta.” Source: company website · checked Sep 2, 2026
14	The Mannik & Smith Group, INCIndirect evidence	Hermitage, PA, United States	501-1,000	467
	“Technical skill, relationships and leadership are the foundation of The Mannik & Smith Group, Inc.(MSG) and have been not just a tradition, but a way of doing business for 70…” Source: company website · checked Sep 2, 2026
15	ALL Native Group, The Federal Services Division Of Ho-Chunk INCPartial evidence	Winnebago, NE, United States	501-1,000	434
	“All Native Group services the federal government both domestically and internationally.” Source: company website · checked Sep 2, 2026
16	Amyx, INCIndirect evidence	Reston, VA, United States	501-1,000	429
	“At Amyx, Inc, a wholly owned subsidiary of Tetra Tech, our mission is to exceed our customer's expectations on every contract, to provide an environment that encourages…” Source: company website · checked Sep 2, 2026
17	Edgewater Federal Solutions, INCStrong evidence	Pocatello, ID, United States	501-1,000	407
	“Edgewater Federal Solutions was founded in 2002 with the mission of being the best IT consulting company possible for our government clients, our contracting partners and our…” Source: company website · checked Sep 2, 2026
18	FCI FederalPartial evidence	Arlington, VA, United States	1,001-5,000	348
	“FCi Federal is now part of PAE.” Source: company website · checked Sep 2, 2026
19	Solix, INCPartial evidence	Parsippany, NJ, United States	501-1,000	347
	“Solix, Inc.(Solix) is a leading national provider of consulting and business process solutions focused on complex program management, eligibility determination, customer care, and…” Source: company website · checked Sep 2, 2026
20	GAP Solutions, INCIndirect evidence	Herndon, VA, United States	501-1,000	347
	Source: company website · checked Sep 2, 2026
21	Business Integra INCIndirect evidence	Bethesda, MD, United States	501-1,000	338
	“JOBSEEKERS: Our Recruiters only ever reach out from BusinessIntegra.com or PeopleIntegra.com email addresses.” Source: company website · checked Sep 2, 2026
22	Lorven Technologies INCIndirect evidence	Plainsboro, NJ, United States	1,001-5,000	323
	“Lorven Technologies, Inc.” Source: company website · checked Sep 2, 2026
23	Mayvin, INCIndirect evidence	Alexandria, VA, United States	501-1,000	310
	“Mayvin is dedicated to protecting the interests of the United States.” Source: company website · checked Sep 2, 2026
24	Whitney, Bradley & Brown WBBIndirect evidence	Reston, VA, United States	501-1,000	272
	“WBB (now a part of Serco) is a leading government and public sector solutions provider, dedicated to the enduring success of our clients.” Source: company website · checked Sep 2, 2026
25	GRSIIndirect evidence	Bethesda, MD, United States	501-1,000	233
	“GRSi is a professional services and technology innovations company, providing state-of-the art solutions across a broad range of requirements, in highly agile yet controlled…” Source: company website · checked Sep 2, 2026

Showing 25 of 5,262 federal consulting firms based in the United States

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Federal consulting firms based in the United States at a glance

As of Sep 2, 2026

1-10Median size (employees)

WashingtonLargest hub · 373 HQs

45,898Contacts with mobile numbers

Sep 2, 2026Data refreshed

Companies by employee count

1-10

3,138

11-50

1,301

51-200

608

201-500

146

501-1,000

1,001-5,000

5,001-10,000

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 federal consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “federal consulting firms”. Matching reads each company's description, not its industry code or its name.
What we exclude: Companies whose own description does not clearly place them among federal 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 an evidence 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, 32,035 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 2, 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.

Federal consulting firms by metro

Federal consulting firms in Washington373
Federal consulting firms in Arlington134
Federal consulting firms in Atlanta118
Federal consulting firms in Alexandria99
Federal consulting firms in New York94
Federal consulting firms in Reston86
Federal consulting firms in Houston65

Frequently asked

How many federal consulting firms are there based in the United States?

RevenueBase identified 5,262 federal 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?

Mantech, headquartered in Herndon, tops this list with the largest team on record.

Which city has the most federal consulting firms?

Washington leads with 373 headquartered companies, followed by Arlington (134) and Atlanta (118).

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 32,035 verified decision-maker contacts tracked across these 5,262 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 2, 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 SmartSearch, 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.