Company lists · Data refreshed September 2026

Top 25 Government consulting services based in Fairfax, United States

Name: Government consulting services based in Fairfax, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 47 companies tracked

RevenueBase identified 47 government consulting services headquartered in Fairfax, United States as of September 2026 and tracks 1,333 professional contacts across them, including 197 with verified work emails. Washington is the largest hub.

This list covers government consulting services headquartered in Fairfax, 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 21, 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 21, 2026 86% judged on-target in blind review

47Companies

1,333Contacts tracked

197Verified emails

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The 25 largest government consulting services based in Fairfax, United States

Ranked by team size

Top 25 of 47 government consulting services based in Fairfax, United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to government consulting services: 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	GSA National	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	201-500	558 contacts →
	Partial evidence “GSA National has been helping government contractors ensure compliance and streamline costs since 1991.” Source: RevenueBase Database · checked Sep 21, 2026
2	ICF Macro	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	5,001-10,000	197 contacts →
	Indirect evidence “As of April of 2009, Macro International is now part of ICF.” Source: RevenueBase Database · checked Sep 21, 2026
3	Mcking Consulting	Strong evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	51-200	118 contacts →
	Strong evidence “McKing Consulting Corporation provides a variety of general and specialized management consulting services to the federal government, state agencies, nonprofits, and public and…” Source: RevenueBase Database · checked Sep 21, 2026
4	Widelity, INC	Partial evidence	Fairfax, United StatesHQ checked Sep 21, 2026	51-200	92 contacts →
	Partial evidence “Founded in 2006, Widelity is a leading provider of business and network engineering consulting to global technology driven industries.” Source: RevenueBase Database · checked Sep 21, 2026
5	Inforeliance	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	201-500	70 contacts →
	Indirect evidence “When organizations need to be on time-and on budget-they call InfoReliance.” Source: RevenueBase Database · checked Sep 21, 2026
6	ERPI	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	201-500	57 contacts →
	Indirect evidence “Enterprise Resource Performance Inc.(ERPi) is a professional services rm that delivers strategic, advisory, technological, and implementation support services to Federal Agencies.” Source: RevenueBase Database · checked Sep 21, 2026
7	Burdeshaw Associates LLC	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	51-200	39 contacts →
	Indirect evidence “Burdeshaw Associates, LLC has nearly 40 years of unparalleled leadership and "real world" experience from retired flag officers and SES level executives in the areas of Domestic…” Source: RevenueBase Database · checked Sep 21, 2026
8	Grey Street Consulting, LLC	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	11-50	17 contacts →
	Partial evidence “Grey Street Consulting, LLC (GSC), headquartered in Fairfax Station, VA is an economically disadvantaged woman-owned small business, federal contracting firm that received…” Source: RevenueBase Database · checked Sep 21, 2026
9	Pivot Path Solutions	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	11-50	16 contacts →
	Partial evidence “Pivot Path Solutions is a small business consulting firm focused on helping organizations improve operations and program performance.” Source: RevenueBase Database · checked Sep 21, 2026
10	Advanced Systems, Inc. ASI	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	1-10	13 contacts →
	Indirect evidence “Advanced Systems Incorporated (ASI) offers planning, analytical, strategic/tactical, management, operations and consultative support, to Federal, commercial and non-profit…” Source: RevenueBase Database · checked Sep 21, 2026
11	Watts Group, INC	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	11-50	10 contacts →
	Indirect evidence “Founded in 2005, Watts Group has an experienced and responsive team of accounting and systems implementation experts.” Source: RevenueBase Database · checked Sep 21, 2026
12	Arena Strategic Advisors, LLC	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	1-10	10 contacts →
	Partial evidence “Arena provides a full spectrum of strategic planning, corporate development, M&A due diligence, post-merger integration, and operational improvement consulting services to…” Source: RevenueBase Database · checked Sep 21, 2026
13	BG Consulting Services	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	11-50	8 contacts →
	Partial evidence “BG Consulting Services, LLC, is a small Veteran-owned, woman-owned, consulting firm primarily focused on the business of servicing healthcare organizations and agencies.” Source: RevenueBase Database · checked Sep 21, 2026
14	EKO Strategies, LLC	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	11-50	7 contacts →
	Indirect evidence “When it comes to technology, one thing for certain is that nothing is going to stay the same.” Source: RevenueBase Database · checked Sep 21, 2026
15	Homes, Lowry, Horn & Johnson, LTD	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	11-50	7 contacts →
	Indirect evidence “UPDATE: As of December 1, 2020, Homes, Lowry, Horn & Johnson, Ltd.” Source: RevenueBase Database · checked Sep 21, 2026
16	Vsingh CPA LLC	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	1-10	5 contacts →
	Partial evidence “Specializing in government contracting, VSINGH CPA LLC offers expert financial and accounting services.” Source: RevenueBase Database · checked Sep 21, 2026
17	Clarus Consulting LLC	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	11-50	5 contacts →
	Partial evidence “Clarus Consulting was created as a Limited Liability Company in Virginia in April Clarus has private clients in financial services, education finance, information technology, and…” Source: RevenueBase Database · checked Sep 21, 2026
18	Gyanni INC	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	11-50	5 contacts →
	Partial evidence “Gyanni Inc, founded in is a certified small business minority woman owned company that provides information technology and management consulting Services to the Federal and State…” Source: RevenueBase Database · checked Sep 21, 2026
19	Excelsior Consulting Group, LLC	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	11-50	4 contacts →
	Partial evidence “Excelsior Consulting Group LLC is a Woman and Minority owned SBA 8(m) business with a pending application for SBA 8(a) certification.” Source: RevenueBase Database · checked Sep 21, 2026
20	The Quiah Group, LLC	Partial evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	1-10	4 contacts →
	Partial evidence “Quiah Group is a consulting firm that delivers expert, objective insights, a tailored approach and unparalleled collaboration to help leaders.” Source: RevenueBase Database · checked Sep 21, 2026
21	Gray Rock Consulting LLC	Strong evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	1-10	3 contacts →
	Strong evidence “Gray Rock Consulting LLC is a small business based in the Washington DC metro area providing high-quality management consulting and technology services to the Federal government…” Source: RevenueBase Database · checked Sep 21, 2026
22	Strategy To WIN Consulting Group	Strong evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	1-10	3 contacts →
	Strong evidence “Strategy To Win Consulting Group (S2W) provides management consulting services to government contractors and those looking to work in government markets.” Source: RevenueBase Database · checked Sep 21, 2026
23	Cromack & Associates	Partial evidence	Fairfax, United StatesHQ checked Sep 21, 2026	1-10	2 contacts →
	Partial evidence “Helping grow your Government Contracting Business.” Source: RevenueBase Database · checked Sep 21, 2026
24	Caasus, LLC	Strong evidence	Fairfax, United StatesHQ checked Sep 21, 2026	1-10	2 contacts →
	Strong evidence “CaaSus is a company dedicated to supporting the Federal regulatory, audit and cost accounting needs of growing government contractors through alternative consulting models.” Source: RevenueBase Database · checked Sep 21, 2026
25	Parrish, Blessing & Associates, INC	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 21, 2026	1-10	2 contacts →
	Indirect evidence 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: government consulting services. 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 government consulting services.
Partial evidence: Its own public description names part of government consulting services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name government consulting services. 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 47 government consulting services based in Fairfax, United States

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Government consulting services based in Fairfax, United States at a glance

As of Sep 21, 2026

14.8%Verified-email coverage

28.4Average contacts per company

1-10Median size (employees)

851.1%Largest-city concentration · Washington

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

5,001-10,000

Email recency for this list is measured across the whole United States list rather than for Fairfax, so it is reported there. Company counts and contact totals on this page are exact for Fairfax, over 47 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 government consulting services, 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 Fairfax, United States whose own description of what they do matches “government consulting services”. 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 government consulting services), 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 government consulting services, and records with no verified work email. Companies headquartered outside Fairfax 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, 197 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.

Government consulting services by metro in the United States

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 government consulting services, 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 government consulting services are there based in Fairfax, United States?

RevenueBase identified 47 government consulting services headquartered in Fairfax, 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?

GSA National, headquartered in Fairfax, tops this list with the largest team on record.

Which city has the most government consulting services?

Washington leads with 400 headquartered companies, followed by New York (180) and Houston (145).

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 197 verified decision-maker contacts tracked across these 47 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.