Company lists · Data refreshed September 2026

Top 25 Civil service consulting firms based in the United States

Name: Civil service 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 27, 2026 2,162 companies tracked

RevenueBase identified 2,162 civil service consulting firms headquartered in the United States as of September 2026 and tracks 27,665 professional contacts across them, including 9,805 with verified work emails. Washington is the largest hub.

This list covers civil service 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 27, 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 27, 2026 86% judged on-target in blind review

2,162Companies

27,665Contacts tracked

9,805Verified emails

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The 25 largest civil service consulting firms based in the United States

Ranked by team size

Top 25 of 2,162 civil service consulting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 27, 2026. RevenueBase Smart Search rates how each company's information relates to civil service 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	ABT Global	Partial evidence	Rockville, MD, United StatesHQ checked Sep 27, 2026	1,001-5,000	3,323 contacts →
	Partial evidence “Abt is a mission-driven consulting and research firm.” Source: RevenueBase Database · checked Sep 27, 2026
2	Ardurra	Indirect evidence	Miami, FL, United StatesHQ checked Sep 27, 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 27, 2026
3	ERG	Partial evidence	Concord, MA, United StatesHQ checked Sep 27, 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 27, 2026
4	Acumen, LLC	Indirect evidence	Burlingame, CA, United StatesHQ checked Sep 27, 2026	501-1,000	570 contacts →
	Indirect evidence “Acumen, LLC works to improve the information provided to policymakers who design and revise welfare, health, education, labor, and business programs at the national, state, and…” Source: RevenueBase Database · checked Sep 27, 2026
5	The Mannik & Smith Group, INC	Indirect evidence	Maumee, OH, United StatesHQ checked Sep 27, 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 27, 2026
6	Edgewater Federal Solutions, INC	Partial evidence	Frederick, MD, United StatesHQ checked Sep 27, 2026	501-1,000	410 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 27, 2026
7	Iquasar LLC	Indirect evidence	Sterling, VA, United StatesHQ checked Sep 27, 2026	201-500	312 contacts →
	Indirect evidence “Based in Sterling, Virginia, iQuasar LLC, with over 20 years of experience, we help small and medium businesses grow in the federal marketplace through Proposal Development…” Source: RevenueBase Database · checked Sep 27, 2026
8	Cbeyondata SMX	Indirect evidence	Arlington, VA, United StatesHQ checked Sep 27, 2026	201-500	266 contacts →
	Indirect evidence “cBEYONData improves the business of government by understanding the overlapping relationship between data and dollars.” Source: RevenueBase Database · checked Sep 27, 2026
9	TCG	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	263 contacts →
	Indirect evidence “Traditional we are not.” Source: RevenueBase Database · checked Sep 27, 2026
10	SSA Consultants	Indirect evidence	Baton Rouge, LA, United StatesHQ checked Sep 27, 2026	n/a	258 contacts →
	Indirect evidence “We are partners and advisors of leading organizations and governments, bound to and inspired by a mission of helping our clients improve their performance.” Source: RevenueBase Database · checked Sep 27, 2026
11	Manhattan Strategy Group	Partial evidence	Bethesda, MD, United StatesHQ checked Sep 27, 2026	51-200	257 contacts →
	Partial evidence “Manhattan Strategy is a boutique research and management consulting firm dedicated to helping our government and commercial clients achieve performance excellence.” Source: RevenueBase Database · checked Sep 27, 2026
12	Interwest Consulting Group	Partial evidence	Irvine, CA, United StatesHQ checked Sep 27, 2026	201-500	221 contacts →
	Partial evidence “Interwest specializes in providing professional and consulting services to public agencies across California, Nevada, Colorado, and beyond.” Source: RevenueBase Database · checked Sep 27, 2026
13	CPS HR Consulting	Partial evidence	Sacramento, CA, United StatesHQ checked Sep 27, 2026	51-200	200 contacts →
	Partial evidence “For over 40 years, CPS HR Consulting has delivered trusted HR solutions that strengthen the public sector.” Source: RevenueBase Database · checked Sep 27, 2026
14	ICF Macro	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 27, 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 27, 2026
15	ASI Government	Indirect evidence	Herndon, VA, United StatesHQ checked Sep 27, 2026	51-200	192 contacts →
	Indirect evidence “For nearly two decades, ASI Government has served as a trusted advisor to government leaders seeking to improve mission performance, enhance organizational effectiveness and drive…” Source: RevenueBase Database · checked Sep 27, 2026
16	Golden KEY Group	Indirect evidence	Reston, VA, United StatesHQ checked Sep 27, 2026	201-500	174 contacts →
	Indirect evidence “Golden Key Group is a trusted, agile, and customer-focused professional services firm dedicated to helping the federal government solve today’s strategic, organizational and…” Source: RevenueBase Database · checked Sep 27, 2026
17	Mcallister & Quinn	Partial evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	170 contacts →
	Partial evidence “McAllister & Quinn is a Washington, DC consulting firm that provides a comprehensive range of services to a diverse group of clients with issues before the federal government.” Source: RevenueBase Database · checked Sep 27, 2026
18	Ripple Effect	Partial evidence	Rockville, MD, United StatesHQ checked Sep 27, 2026	201-500	152 contacts →
	Partial evidence “Ripple Effect provides professional consulting and exceptional talent for federal, private, and non-profit clients to deliver some of the most crucial policies and programs that…” Source: RevenueBase Database · checked Sep 27, 2026
19	FW Cook	Indirect evidence	New York, NY, United StatesHQ checked Sep 27, 2026	51-200	145 contacts →
	Indirect evidence “From the beginning, Frederic W.” Source: RevenueBase Database · checked Sep 27, 2026
20	Herren Associates	Indirect evidence	Washington, DC, United StatesHQ checked Sep 27, 2026	51-200	142 contacts →
	Indirect evidence “Here at Herren, our goals are to drive efficiency and maximize the value of every dollar our clients spend.” Source: RevenueBase Database · checked Sep 27, 2026
21	Project ONE	Partial evidence	Reading, MA, United StatesHQ checked Sep 27, 2026	1,001-5,000	142 contacts →
	Partial evidence “Eliassen Group has been providing strategic consulting and talent solutions to drive our clients' innovation and business results for over 30 years.” Source: RevenueBase Database · checked Sep 27, 2026
22	St. Michael's INC	Indirect evidence	Woodbridge, VA, United StatesHQ checked Sep 27, 2026	51-200	139 contacts →
	Indirect evidence “St.” Source: RevenueBase Database · checked Sep 27, 2026
23	Arservices	Partial evidence	Falls Church, VA, United StatesHQ checked Sep 27, 2026	201-500	138 contacts →
	Partial evidence “ARServices is the management, professional and technology consulting services provider of choice by government agencies that demand agility, reliability, and sustained quality…” Source: RevenueBase Database · checked Sep 27, 2026
24	Savantage Solutions	Partial evidence	Rockville, MD, United StatesHQ checked Sep 27, 2026	51-200	127 contacts →
	Partial evidence “Savantage Solutions provides a wide range of consulting, integration, technology and support solutions and services to Federal agencies.” Source: RevenueBase Database · checked Sep 27, 2026
25	MO	Indirect evidence	Scottsdale, AZ, United StatesHQ checked Sep 27, 2026	11-50	124 contacts →
	Indirect evidence “MO helps government leaders achieve their mission by designing intuitive and sustainable experiences that build trust, improve satisfaction, and reduce burden.” Source: RevenueBase Database · checked Sep 27, 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: civil service 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 civil service consulting firms.
Partial evidence: Its own public description names part of civil service consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name civil service 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 2,162 civil service consulting firms based in the United States

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Civil service consulting firms based in the United States at a glance

As of Sep 27, 2026

35.4%Verified-email coverage

12.8Average contacts per company

1-10Median size (employees)

7.3%Largest-city concentration · Washington

Sep 27, 2026Page data refreshed

Companies by employee count

1-10

1,449

11-50

522

51-200

147

201-500

501-1,000

1,001-5,000

5,001-10,000

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 2,162 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 civil service 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 “civil service 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 civil service 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 civil service 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, 9,805 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 27, 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.

Civil service 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 civil service 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 civil service consulting firms are there based in the United States?

RevenueBase identified 2,162 civil service 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?

ABT Global, headquartered in Rockville, tops this list with the largest team on record.

Which city has the most civil service consulting firms?

Washington leads with 158 headquartered companies, followed by Arlington (50) and New York (50).

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 9,805 verified decision-maker contacts tracked across these 2,162 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 27, 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.