Company lists · Data refreshed September 2026

Top 25 Federal government consulting firms worldwide

Name: Federal government consulting firms worldwide
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 10,519 companies tracked

RevenueBase identified 10,519 federal government consulting firms worldwide as of September 2026 and tracks 145,333 professional contacts across them, including 38,613 with verified work emails. The United States is the largest market and Washington the largest hub.

This list covers federal government consulting firms worldwide, 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 21, 2026. Country and city lists for federal government consulting firms follow the table.

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 21, 2026 86% judged on-target in blind review

10,519Companies

145,333Contacts tracked

38,613Verified emails

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The 25 largest federal government consulting firms worldwide

Ranked by team size

Top 25 of 10,519 federal government consulting firms worldwide, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to federal government 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	Mantech	Indirect evidence	Herndon, VA, United StatesHQ checked Sep 21, 2026	5,001-10,000	9,697 contacts →
	Indirect evidence “MANTECH is more than a technology company.” Source: RevenueBase Database · checked Sep 21, 2026
2	Asrc Federal	Partial evidence	Reston, VA, United StatesHQ checked Sep 21, 2026	5,001-10,000	4,542 contacts →
	Partial evidence “ASRC Federal’s employees provide solutions for more than 30 U.S.” Source: RevenueBase Database · checked Sep 21, 2026
3	American Systems	Strong evidence	Mclean, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,899 contacts →
	Strong evidence “Founded in 1975, AMERICAN SYSTEMS is an employee-owned federal government contractor supporting national priority programs through our strategic solutions in the areas of…” Source: RevenueBase Database · checked Sep 21, 2026
4	DCS Corp	Partial evidence	Alexandria, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	1,898 contacts →
	Partial evidence “DCS delivers advanced technology and management solutions to Government agencies in the national security sector.” Source: RevenueBase Database · checked Sep 21, 2026
5	Kearney & Company	Partial evidence	Alexandria, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	999 contacts →
	Partial evidence “Established in 1985, Kearney & Company is the largest Certified Public Accounting (CPA) firm in the country exclusively focused on the government.” Source: RevenueBase Database · checked Sep 21, 2026
6	PPC	Indirect evidence	Trevose, PA, United StatesHQ checked Sep 21, 2026	201-500	979 contacts →
	Indirect evidence “PPC is now part of DSA” Source: RevenueBase Database · checked Sep 21, 2026
7	The MIL Corporation	Strong evidence	Bowie, MD, United StatesHQ checked Sep 21, 2026	501-1,000	941 contacts →
	Strong evidence “Established in 1980, MIL provides innovative cyber, engineering, financial, and information technology services to the federal government.” Source: RevenueBase Database · checked Sep 21, 2026
8	Odyssey Systems	Partial evidence	Wakefield, MA, United StatesHQ checked Sep 21, 2026	1,001-5,000	906 contacts →
	Partial evidence “Odyssey is a leading provider of outstanding management, analytical, and technical support services to both the government and private sectors.” Source: RevenueBase Database · checked Sep 21, 2026
9	Iron BOW Technologies	Partial evidence	Herndon, VA, United StatesHQ checked Sep 21, 2026	501-1,000	841 contacts →
	Partial evidence “We deliver mission success through next-generation solutions across government, healthcare, and commercial markets.” Source: RevenueBase Database · checked Sep 21, 2026
10	Cognosante	Indirect evidence	Falls Church, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	829 contacts →
	Indirect evidence “At Cognosante, we help create a safe, healthy, more equitable nation for all.” Source: RevenueBase Database · checked Sep 21, 2026
11	Mvm, INC	Partial evidence	San Antonio, TX, United StatesHQ checked Sep 21, 2026	501-1,000	826 contacts →
	Partial evidence “MVM has been providing exceptional service to federal clients since its founding in 1979.” Source: RevenueBase Database · checked Sep 21, 2026
12	Systems Engineering Services Corporation Sesc	Partial evidence	Reston, VA, United StatesHQ checked Sep 21, 2026	201-500	747 contacts →
	Partial evidence “Systems Engineering Services Corporation (SESC), founded in 1989, is a leading provider of technology solutions to Fortune companies and government organizations.” Source: RevenueBase Database · checked Sep 21, 2026
13	Hx5, LLC	Strong evidence	Fort Walton Beach, FL, United StatesHQ checked Sep 21, 2026	1,001-5,000	673 contacts →
	Strong evidence “HX5, LLC has specialized in providing professional support services to meet the needs of Federal Government organizations since its incorporation in 2004.” Source: RevenueBase Database · checked Sep 21, 2026
14	ERG	Partial evidence	Concord, MA, United StatesHQ checked Sep 21, 2026	501-1,000	663 contacts →
	Partial evidence “ERG is a multidisciplinary consulting firm offering a broad range of professional services.” Source: RevenueBase Database · checked Sep 21, 2026
15	CAT Technologies LTD	Partial evidence	Hyd, IndiaHQ checked Sep 21, 2026	201-500	660 contacts →
	Partial evidence “CAT Technology Inc, established in October is engaged in providing quality consulting services in Systems Analysis, System Design, Database Administration, Systems Engineering…” Source: RevenueBase Database · checked Sep 21, 2026
16	Salient Crgt	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	639 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 21, 2026
17	Abacus Technology Corporation	Indirect evidence	Chevy Chase, MD, United StatesHQ checked Sep 21, 2026	501-1,000	627 contacts →
	Indirect evidence “Abacus Technology Corporation delivers leading edge, high quality assistance in response to complex technology challenges.” Source: RevenueBase Database · checked Sep 21, 2026
18	Planned Systems International	Partial evidence	Columbia, MD, United StatesHQ checked Sep 21, 2026	1,001-5,000	611 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 21, 2026
19	Trax International Corporation	Indirect evidence	Las Vegas, NV, United StatesHQ checked Sep 21, 2026	1,001-5,000	587 contacts →
	Indirect evidence “TRAX International has more than 30 years of experience delivering a range of professional technical services to the U.S.” Source: RevenueBase Database · checked Sep 21, 2026
20	DLC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	201-500	546 contacts →
	Partial evidence “DLC is an award-winning industry leader in Finance, Accounting, Program Management & Process Improvement Consulting.” Source: RevenueBase Database · checked Sep 21, 2026
21	GVA	Indirect evidence	Paris, FranceHQ checked Sep 21, 2026	51-200	499 contacts →
	Indirect evidence “Créé en 1975, GVA est composé de 80 personnes, pour près de 10 millions de chiffre d’affaires.” Source: RevenueBase Database · checked Sep 21, 2026
22	ITI	Indirect evidence	Québec, QC, CanadaHQ checked Sep 21, 2026	201-500	490 contacts →
	Indirect evidence “We promote human, organizational and operational intelligence, not just artificial intelligence.” Source: RevenueBase Database · checked Sep 21, 2026
23	Vencore INC	Indirect evidence	Chantilly, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	485 contacts →
	Indirect evidence “As of June 1, 2018, we are Perspecta.” Source: RevenueBase Database · checked Sep 21, 2026
24	The Mannik & Smith Group, INC	Indirect evidence	Maumee, OH, United StatesHQ checked Sep 21, 2026	501-1,000	467 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 21, 2026
25	ALL Native Group, The Federal Services Division Of Ho-Chunk INC	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	501-1,000	437 contacts →
	Partial evidence “For more than 20 years, All Native Group has delivered specialized expertise to federal agencies across civilian, defense, intelligence, and international missions.” Source: RevenueBase Database · checked Sep 21, 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: federal government 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 federal government consulting firms.
Partial evidence: Its own public description names part of federal government consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name federal government 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 10,519 federal government consulting firms worldwide

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Federal government consulting firms worldwide at a glance

As of Sep 21, 2026

26.6%Verified-email coverage

13.8Average contacts per company

1-10Median size (employees)

3.5%Largest-city concentration · Washington

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

6,915

11-50

2,346

51-200

878

201-500

231

501-1,000

1,001-5,000

5,001-10,000

10001+

Email recency is reported on each country list linked below.

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 government 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.
Coverage: Every country. Country and city lists for federal government consulting firms are linked below.
What qualifies: Companies worldwide whose own description of what they do matches “federal government 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 federal government 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 federal government consulting firms, and records with no verified work email.
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, 38,613 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 21, 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 government consulting firms by location

56 lists · largest first

Every Federal government consulting firms list RevenueBase publishes, by country and city. Counts are matching companies in each list as of its own refresh date.

Countries

Cities

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 federal government 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 federal government consulting firms are there worldwide?

RevenueBase identified 10,519 federal government consulting firms worldwide 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 country has the most federal government consulting firms?

The United States leads with 4,387 companies, followed by the United Kingdom (561) and France (445). Every federal government consulting firms list by country and city is linked on this page.

Which city has the most federal government consulting firms?

Washington leads with 368 headquartered companies, followed by London (131) and Arlington (127).

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 38,613 verified decision-maker contacts tracked across these 10,519 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 21, 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.