Company lists · Data refreshed September 2026

Top 25 Staff augmentation services based in the United States

Name: Staff augmentation services based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 21, 2026 14,327 companies tracked

RevenueBase identified 14,327 staff augmentation services headquartered in the United States as of September 2026 and tracks 709,056 professional contacts across them, including 106,035 with verified work emails. New York is the largest hub.

This list covers staff augmentation services 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 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

14,327Companies

709,056Contacts tracked

106,035Verified emails

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The 25 largest staff augmentation services based in the United States

Ranked by team size

Top 25 of 14,327 staff augmentation services based in the United States, ranked by team size, largest first. Data refreshed Sep 21, 2026. RevenueBase Smart Search rates how each company's information relates to staff augmentation 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	KELLY	Indirect evidence	Troy, MI, United StatesHQ checked Sep 21, 2026	10001+	30,378 contacts →
	Indirect evidence “We’ve been helping organizations find the people they need longer than any other company in the world.” Source: RevenueBase Database · checked Sep 21, 2026
2	Manpowergroup	Indirect evidence	Milwaukee, WI, United StatesHQ checked Sep 21, 2026	10001+	27,063 contacts →
	Indirect evidence “ManpowerGroup® (NYSE: MAN), the leading global workforce solutions company, helps organizations transform in a fast-changing world of work by sourcing, assessing, developing and…” Source: RevenueBase Database · checked Sep 21, 2026
3	Robert Half	Indirect evidence	Menlo Park, CA, United StatesHQ checked Sep 21, 2026	10001+	25,574 contacts →
	Indirect evidence “At Robert Half, we prioritize your security-if you believe you've encountered a scam or fraudulent recruiter, please report it immediately to All Robert Half recruiters…” Source: RevenueBase Database · checked Sep 21, 2026
4	Manpower	Indirect evidence	Milwaukee, WI, United StatesHQ checked Sep 21, 2026	10001+	22,508 contacts →
	Indirect evidence “Manpower is the global leader in contingent and permanent recruitment workforce solutions.” Source: RevenueBase Database · checked Sep 21, 2026
5	Aerotek	Indirect evidence	Hanover, MD, United StatesHQ checked Sep 21, 2026	n/a	18,268 contacts →
	Indirect evidence “From economic headwinds to talent complexities, the challenges facing North American industry are real.” Source: RevenueBase Database · checked Sep 21, 2026
6	Insight Global	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	n/a	15,553 contacts →
	Indirect evidence “Insight Global is an international talent and consulting company that delivers business outcomes in an ever-changing world.” Source: RevenueBase Database · checked Sep 21, 2026
7	Express Employment International	Indirect evidence	Oklahoma City, OK, United StatesHQ checked Sep 21, 2026	10001+	12,647 contacts →
	Indirect evidence “Founded in 1983 and corporately headquartered in Oklahoma City, Express Employment International supports the Express Employment Professionals franchise and related brands.” Source: RevenueBase Database · checked Sep 21, 2026
8	Randstad USA	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	1,001-5,000	8,522 contacts →
	Indirect evidence “Randstad North America, Inc.” Source: RevenueBase Database · checked Sep 21, 2026
9	Kforce INC	Indirect evidence	Tampa, FL, United StatesHQ checked Sep 21, 2026	1,001-5,000	6,147 contacts →
	Indirect evidence “Kforce is a solutions firm specializing in technology, finance and accounting, and professional staffing services.” Source: RevenueBase Database · checked Sep 21, 2026
10	Peopleready	Indirect evidence	Tacoma, WA, United StatesHQ checked Sep 21, 2026	10001+	5,482 contacts →
	Indirect evidence “Want to be part of an award-winning team that is reimagining the way people connect with work?” Source: RevenueBase Database · checked Sep 21, 2026
11	Tradesmen International	Indirect evidence	Macedonia, OH, United StatesHQ checked Sep 21, 2026	10001+	4,999 contacts →
	Indirect evidence “Founded in 1992, Tradesmen International is North America’s premier resource for proven skilled craftsmen and labor consulting services.” Source: RevenueBase Database · checked Sep 21, 2026
12	Lancesoft, INC	Indirect evidence	Herndon, VA, United StatesHQ checked Sep 21, 2026	5,001-10,000	4,877 contacts →
	Indirect evidence “Established in LanceSoft is a pioneer in delivering top-notch Global Workforce Solutions and IT Services to a diverse clientele.” Source: RevenueBase Database · checked Sep 21, 2026
13	VOLT	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	1,001-5,000	4,831 contacts →
	Indirect evidence “Volt (an Innova Solutions affiliate) is a multi-award winning global workforce solutions provider that propels businesses and careers forward with expert momentum.” Source: RevenueBase Database · checked Sep 21, 2026
14	Appleone Employment Services	Indirect evidence	Glendale, CA, United StatesHQ checked Sep 21, 2026	1,001-5,000	4,627 contacts →
	Indirect evidence “AppleOne Employment Services is a full-service employment company.” Source: RevenueBase Database · checked Sep 21, 2026
15	Spherion	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	10001+	4,263 contacts →
	Indirect evidence “We’re Spherion-a staffing and recruiting pioneer that’s been driving careers and helping businesses grow for over 75 years.” Source: RevenueBase Database · checked Sep 21, 2026
16	Select Staffing	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	10001+	3,934 contacts →
	Indirect evidence “Select Staffing is a leading provider of temporary staffing and employment services in the U.S, with nationwide operations across multiple contingent staffing sectors.” Source: RevenueBase Database · checked Sep 21, 2026
17	Artech L.L.C	Indirect evidence	Morristown, NJ, United StatesHQ checked Sep 21, 2026	5,001-10,000	3,674 contacts →
	Indirect evidence “Artech is the largest Women-Owned IT Staffing Firm in the U.S, with 34+ years of experience powering workforce transformation for Fortune 500 companies and public-sector…” Source: RevenueBase Database · checked Sep 21, 2026
18	Elwood Staffing Services, INC	Indirect evidence	Columbus, IN, United StatesHQ checked Sep 21, 2026	n/a	3,481 contacts →
	Indirect evidence “Whether you're looking to find your next great employee, make your next career move, or help a friend find a new job, you can trust that Elwood puts its passion and expertise into…” Source: RevenueBase Database · checked Sep 21, 2026
19	Beacon Hill	Indirect evidence	Boston, MA, United StatesHQ checked Sep 21, 2026	1,001-5,000	3,238 contacts →
	Indirect evidence “Beacon Hill was founded to set a new standard in search, career placement and flexible staffing.” Source: RevenueBase Database · checked Sep 21, 2026
20	Allegis Group	Indirect evidence	Hanover, MD, United StatesHQ checked Sep 21, 2026	10001+	3,103 contacts →
	Indirect evidence “As the global leader in talent solutions, we take pride in what we do, connecting great people to great opportunities, helping businesses win and careers soar.” Source: RevenueBase Database · checked Sep 21, 2026
21	Pyramid Consulting, INC	Indirect evidence	United StatesHQ checked Sep 21, 2026	5,001-10,000	2,891 contacts →
	Indirect evidence “Pyramid Consulting, a global leader in workforce and technology solutions, empowers individuals and organizations to transform and thrive in the most challenging and competitive…” Source: RevenueBase Database · checked Sep 21, 2026
22	Dexian	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 21, 2026	1,001-5,000	2,852 contacts →
	Indirect evidence “Dexian is a leading provider of staffing, IT, and workforce solutions with nearly employees and 70 locations worldwide.” Source: RevenueBase Database · checked Sep 21, 2026
23	Randstad Digital Americas	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 21, 2026	10001+	2,746 contacts →
	Indirect evidence “Randstad Digital is a trusted digital enablement partner that facilitates accelerated transformation for businesses by providing global talent, capacity, and solutions across…” Source: RevenueBase Database · checked Sep 21, 2026
24	Staff Management SMX	Partial evidence	Chicago, IL, United StatesHQ checked Sep 21, 2026	501-1,000	2,680 contacts →
	Partial evidence “Founded in 1988, Staff Management is a recognized leader of comprehensive workforce solutions that deliver best talent, drive compliance, yield tangible savings and build…” Source: RevenueBase Database · checked Sep 21, 2026
25	Oxford Global Resources	Indirect evidence	Beverly, MA, United StatesHQ checked Sep 21, 2026	501-1,000	2,564 contacts →
	Indirect evidence “Oxford Global Resources delivers tailored solutions for any technical challenges you are facing using our partnership-first approach.” 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: staff augmentation 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 staff augmentation services.
Partial evidence: Its own public description names part of staff augmentation services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name staff augmentation 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 14,327 staff augmentation services based in the United States

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Staff augmentation services based in the United States at a glance

As of Sep 21, 2026

15.0%Verified-email coverage

49.5Average contacts per company

11-50Median size (employees)

3.4%Largest-city concentration · New York

Sep 21, 2026Page data refreshed

Companies by employee count

1-10

5,098

11-50

4,501

51-200

2,909

201-500

967

501-1,000

407

1,001-5,000

296

5,001-10,000

10001+

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 14,327 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 staff augmentation 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 the United States whose own description of what they do matches “staff augmentation 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 staff augmentation 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 staff augmentation services, 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, 106,035 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 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.

Staff augmentation services 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 staff augmentation 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 staff augmentation services are there based in the United States?

RevenueBase identified 14,327 staff augmentation services 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?

KELLY, headquartered in Troy, tops this list with the largest team on record.

Which city has the most staff augmentation services?

New York leads with 482 headquartered companies, followed by Houston (394) and Dallas (290).

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 106,035 verified decision-maker contacts tracked across these 14,327 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.