Company lists · Data refreshed September 2026

Top 25 Administrative consulting firms based in the United States

Name: Administrative 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 28, 2026 18,155 companies tracked

RevenueBase identified 18,155 administrative consulting firms headquartered in the United States as of September 2026 and tracks 134,493 professional contacts across them, including 47,418 with verified work emails and 51,161 with mobile numbers. New York is the largest hub.

This list covers administrative 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

18,155Companies

134,493Contacts tracked

47,418Verified emails

51,161Mobile numbers

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The 25 largest administrative consulting firms based in the United States

Ranked by team size

Top 25 of 18,155 administrative 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 administrative 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	Protiviti	Partial evidence	Menlo Park, CA, United StatesHQ checked Sep 28, 2026	5,001-10,000	8,779 contacts →
	Partial evidence “Protiviti is a global consulting firm that delivers deep expertise, objective insights, a tailored approach and unparalleled collaboration to help leaders confidently face the…” Source: RevenueBase Database · checked Sep 28, 2026
2	Kearney	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	5,001-10,000	6,978 contacts →
	Partial evidence “As one of the original firms, we’ve never lost sight of the fact that consulting is a people business.” Source: RevenueBase Database · checked Sep 28, 2026
3	L.E.K. Consulting	Indirect evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	4,093 contacts →
	Indirect evidence “L.E.K.” Source: RevenueBase Database · checked Sep 28, 2026
4	Public Consulting Group	Partial evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	2,694 contacts →
	Partial evidence “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: RevenueBase Database · checked Sep 28, 2026
5	Analysis Group	Partial evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,781 contacts →
	Partial 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
6	ALKU	Partial evidence	Andover, MA, United StatesHQ checked Sep 28, 2026	201-500	1,480 contacts →
	Partial evidence “ALKU® is a highly specialized consulting services firm focused on deploying highly skilled consulting resources in the areas of Technologies, HCIT, Life Sciences, and Government…” Source: RevenueBase Database · checked Sep 28, 2026
7	Charles River Associates	Partial evidence	Boston, MA, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,479 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
8	Davey Resource Group, INC	Partial evidence	Kent, OH, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,395 contacts →
	Partial 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
9	Ardurra	Indirect evidence	Miami, FL, United StatesHQ checked Sep 28, 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 28, 2026
10	Riveron	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,160 contacts →
	Indirect evidence “With over 1,200 professionals across 18 international offices, Riveron delivers tailored solutions for CFOs, private equity firms, and key stakeholders.” Source: RevenueBase Database · checked Sep 28, 2026
11	SEGAL	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	1,001-5,000	1,149 contacts →
	Partial evidence “Segal is a leading employee-owned consulting firm with more than 1,100 professionals across North America, including 150+ credentialed actuaries.” Source: RevenueBase Database · checked Sep 28, 2026
12	W3global	Partial evidence	Frisco, TX, United StatesHQ checked Sep 28, 2026	501-1,000	1,149 contacts →
	Partial evidence “W3Global is a leading provider of end-to-end consulting services, empowering businesses to achieve their strategic goals and optimize their operations.” Source: RevenueBase Database · checked Sep 28, 2026
13	The Vertex Companies LLC	Partial evidence	New York, NY, United StatesHQ checked Sep 28, 2026	501-1,000	765 contacts →
	Partial evidence “The Vertex Companies, LLC is a global consulting firm that provides strategic advisory, project management, and dispute resolution services for organizations that face complex…” Source: RevenueBase Database · checked Sep 28, 2026
14	ERG	Partial evidence	Concord, MA, United StatesHQ checked Sep 28, 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 28, 2026
15	SEI	Partial evidence	Cincinnati, OH, United StatesHQ checked Sep 28, 2026	501-1,000	618 contacts →
	Partial evidence “SEI is a management consulting firm delivering fresh perspectives and reliable results.” Source: RevenueBase Database · checked Sep 28, 2026
16	GSA National	Indirect evidence	Fairfax, VA, United StatesHQ checked Sep 28, 2026	201-500	558 contacts →
	Indirect evidence “GSA National has been helping government contractors ensure compliance and streamline costs since 1991.” Source: RevenueBase Database · checked Sep 28, 2026
17	Solomonedwards	Indirect evidence	Wayne, PA, United StatesHQ checked Sep 28, 2026	1,001-5,000	557 contacts →
	Indirect evidence “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: RevenueBase Database · checked Sep 28, 2026
18	DLC	Partial evidence	Chicago, IL, United StatesHQ checked Sep 28, 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 28, 2026
19	Little Diversified Architectural Consulting	Indirect evidence	Little Global, VA, United StatesHQ checked Sep 28, 2026	201-500	509 contacts →
	Indirect evidence “At Little, we deliver results far beyond architecture-results you wouldn’t expect from an architectural firm.” Source: RevenueBase Database · checked Sep 28, 2026
20	Brown Edwards	Partial evidence	Roanoke, VA, United StatesHQ checked Sep 28, 2026	201-500	496 contacts →
	Partial evidence “Providing Professional Business Advisory and Consulting Services including tax, accounting and IT services.” Source: RevenueBase Database · checked Sep 28, 2026
21	The Mannik & Smith Group, INC	Indirect evidence	Maumee, OH, United StatesHQ checked Sep 28, 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 28, 2026
22	USI Consulting Group	Strong evidence	Glastonbury, CT, United StatesHQ checked Sep 28, 2026	501-1,000	453 contacts →
	Strong evidence “USI Consulting Group (USICG), an industry leading, full-service retirement plan consulting and benefits administration firm, has been helping employers enable their workforce to…” Source: RevenueBase Database · checked Sep 28, 2026
23	Resultant	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 28, 2026	201-500	431 contacts →
	Indirect evidence “We are a passionate team of engineers, mathematicians, data analysts, project managers, and business consultants.” Source: RevenueBase Database · checked Sep 28, 2026
24	Career Group	Partial evidence	Los Angeles, CA, United StatesHQ checked Sep 28, 2026	51-200	416 contacts →
	Partial evidence “Career Group is a widely recognized name in corporate and administrative recruitment.” Source: RevenueBase Database · checked Sep 28, 2026
25	Weaver Consultants Group	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 28, 2026	201-500	382 contacts →
	Indirect evidence “From its inception in 1991, Weaver Consultants Group has been founded upon the tenets of attentive and responsive customer service, strong project management, and solid internal…” Source: RevenueBase Database · checked Sep 28, 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: administrative 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 administrative consulting firms.
Partial evidence: Its own public description names part of administrative consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name administrative 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 18,155 administrative consulting firms based in the United States

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Administrative consulting firms based in the United States at a glance

As of Sep 28, 2026

35.3%Verified-email coverage

38.0%Mobile-number coverage

7.4Average contacts per company

1-10Median size (employees)

3.5%Largest-city concentration · New York

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

14,579

11-50

2,901

51-200

659

201-500

126

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 31.0d

25,5920–30

23,85331–60

1,47461–90

2290–180

292180+

Company record updated

Median 89.0d

00–30

41,59631–60

35,94861–90

61,33990–180

7,989180+

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 administrative 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 “administrative 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 administrative 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 administrative 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, 47,418 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.

Administrative 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 administrative 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 administrative consulting firms are there based in the United States?

RevenueBase identified 18,155 administrative 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?

Protiviti, headquartered in Menlo Park, tops this list with the largest team on record.

Which city has the most administrative consulting firms?

New York leads with 641 headquartered companies, followed by Washington (560) and Atlanta (452).

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 47,418 verified decision-maker contacts tracked across these 18,155 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.