Company lists · Data refreshed September 2026

Top 25 HR outsourcing services based in the United States

Name: HR outsourcing 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 26, 2026 6,072 companies tracked

RevenueBase identified 6,072 company matches for HR outsourcing services associated with the United States as of September 2026 and tracks 217,119 professional contacts across them, including 69,393 with verified work emails and 62,663 with mobile numbers. New York is the largest hub.

This list covers company matches for HR outsourcing services associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 26, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 RevenueBase SmartSearch · Exact Recorded Sep 26, 2026 How this list was built

6,072Companies

217,119Contacts tracked

69,393Verified emails

62,663Mobile numbers

Explore this list → Free signup · no credit card · 500 free credits

The 25 largest HR outsourcing services based in the United States

Ranked by team size

Top 25 of 6,072 company matches for HR outsourcing services based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 26, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	ADP	Exact match	Roseland, NJ, United StatesHQ recorded Sep 26, 2026	10001+	84,166 contacts →
	Exact match “Designing better ways to work through cutting-edge products, premium services and exceptional experiences that enable people to reach their full potential.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
2	Paychex	Exact match	Rochester, NY, United StatesHQ recorded Sep 26, 2026	10001+	17,911 contacts →
	Exact match “As the future of work continues to evolve, Paychex leads the way by making complex HR, payroll, and benefits brilliantly simple.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
3	LHH	Exact match	Jacksonville, FL, United StatesHQ recorded Sep 26, 2026	10001+	12,889 contacts →
	Exact match “At LHH, we believe work should be meaningful, fulfilling, and connected.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
4	Randstad USA	Exact match	Atlanta, GA, United StatesHQ recorded Sep 26, 2026	1,001-5,000	8,522 contacts →
	Exact match “Randstad North America, Inc.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
5	Insperity	Exact match	Kingwood, TX, United StatesHQ recorded Sep 26, 2026	1,001-5,000	4,761 contacts →
	Exact match “Since 1986, Insperity’s mission has been to help businesses succeed so communities prosper.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
6	Trinet	Exact match	Dublin, CA, United StatesHQ recorded Sep 26, 2026	1,001-5,000	4,056 contacts →
	Exact match “TriNet (NYSE: TNET) provides small and medium-size businesses (SMBs) with full-service HR solutions tailored by industry.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
7	PSG Global Solutions	Exact match	Marina Del Rey, CA, United StatesHQ recorded Sep 26, 2026	1,001-5,000	4,000 contacts →
	Exact match “PSG is a global leader in recruitment process optimization, delivering high-performance outsourced recruiting solutions that drive real business results.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
8	GUSTO	Exact match	San Francisco, CA, United StatesHQ recorded Sep 26, 2026	1,001-5,000	3,543 contacts →
	Exact match “Gusto has been growing the small business economy for 15+ years.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
9	Allegis Global Solutions	Exact match	Hanover, MD, United StatesHQ recorded Sep 26, 2026	1,001-5,000	2,866 contacts →
	Exact match “At Allegis Global Solutions (AGS), we’re in the human enterprise business.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
10	Bamboohr	Exact match	Draper, UT, United StatesHQ recorded Sep 26, 2026	1,001-5,000	1,812 contacts →
	Exact match “For 16 years, BambooHR has embarked on a mission to help organizations and their employees build better workplaces and achieve their unique missions.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
11	247hire	Exact match	Oak Brook, IL, United StatesHQ recorded Sep 26, 2026	201-500	1,059 contacts →
	Exact match “At 247Hire, our mission is simple: to empower yours.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
12	Eclaro	Exact match	New York, NY, United StatesHQ recorded Sep 26, 2026	1,001-5,000	1,024 contacts →
	Exact match “ECLARO is an award-winning Talent Solutions firm headquartered in New York City and operating in the U.S, Canada and the Philippines.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
13	Intellipro	Exact match	San Jose, CA, United StatesHQ recorded Sep 26, 2026	501-1,000	990 contacts →
	Exact match “IntelliPro Group Inc.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
14	G&a Partners	Exact match	Houston, TX, United StatesHQ recorded Sep 26, 2026	501-1,000	840 contacts →
	Exact match “Managing HR, payroll, benefits, and compliance can stretch your team thin, and mistakes are costly.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
15	JDA TSG	Exact match	New York, NY, United StatesHQ recorded Sep 26, 2026	501-1,000	786 contacts →
	Exact match “JDA TSG is a preferred global strategic and outsourcing partner of some of the biggest brands in the world.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
16	Asure Software	Exact match	Austin, TX, United StatesHQ recorded Sep 26, 2026	501-1,000	665 contacts →
	Exact match “Asure (NASDAQ: ASUR) sees Human Capital Management (HCM) through the lens of entrepreneurs and executives with an owner’s mentality.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
17	EOX Vantage	Exact match	Cleveland, OH, United StatesHQ recorded Sep 26, 2026	501-1,000	654 contacts →
	Exact match “For over two decades, EOX Vantage has specialized in providing scalable, on-demand support to aid our partners with their current workforce challenges and ensure that their agents…” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
18	Coadvantage	Exact match	Bradenton, FL, United StatesHQ recorded Sep 26, 2026	201-500	586 contacts →
	Exact match “CoAdvantage is now CoAd.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
19	Atlas HXM	Exact match	Chicago, IL, United StatesHQ recorded Sep 26, 2026	501-1,000	580 contacts →
	Exact match “Atlas HXM understands how people work.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
20	HTI	Exact match	Greenville, SC, United StatesHQ recorded Sep 26, 2026	1,001-5,000	553 contacts →
	Exact match “Industrial Staffing \| Professional & Skilled Hourly Recruiting \| HR Services \| Retention Strategies \| Outplacement \| Greenfield Start Ups & Expansions \| Talent Management At HTI…” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
21	Group Management Services, INC	Exact match	Richfield, OH, United StatesHQ recorded Sep 26, 2026	501-1,000	535 contacts →
	Exact match “We provide comprehensive HR solutions to companies of all sizes throughout the United States.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
22	Infosync	Exact match	Wichita, KS, United StatesHQ recorded Sep 26, 2026	501-1,000	525 contacts →
	Exact match “In today's fast-paced business landscape, multi-unit companies demand more than just basic operations-they need expert guidance and cutting-edge technology to thrive.” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
23	Pride Global	Exact match	New York, NY, United StatesHQ recorded Sep 26, 2026	1,001-5,000	448 contacts →
	Exact match “Pride Global is a minority-owned integrated human capital solutions & advisory firm headquartered in New York with operating companies throughout the United States, United…” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
24	Prismhr	Exact match	Chandler, AZ, United StatesHQ recorded Sep 26, 2026	201-500	436 contacts →
	Exact match “PrismHR creates exceptional software and services, empowering human resource outsourcing service providers such as Professional Employer Organizations (PEOs) and HR outsourcers to…” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase
25	Anywhere	Exact match	Silicon Valley, CA, United StatesHQ recorded Sep 26, 2026	n/a	435 contacts →
	Exact match “Nós nascemos no Vale do Silício e aqui aprendemos técnicas inovadoras sobre como fazer Talent Acquisition de uma forma estratégica e que gere impacto no negócio, nós não só…” Recorded in the RevenueBase company graph · Sep 26, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “HR outsourcing services”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 6,072 HR outsourcing services based in the United States

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HR outsourcing services based in the United States at a glance

As of Sep 26, 2026

32.0%Verified-email coverage

28.9%Mobile-number coverage

35.8Average contacts per company

1-10Median size (employees)

3.5%Largest-city concentration · New York

Sep 26, 2026Page data refreshed

Companies by employee count

1-10

4,015

11-50

1,253

51-200

473

201-500

140

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 29.0d

45,1880–30

21,64531–60

1,66161–90

5490–180

845180+

Company record updated

Median 89.0d

00–30

44,92731–60

81,97361–90

75,31990–180

14,900180+

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United States whose business descriptions match “HR outsourcing services” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 69,393 professional contacts with verified work emails across the full matched dataset. 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 26, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

HR outsourcing services by metro

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “HR outsourcing services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many HR outsourcing services are there based in the United States?

RevenueBase identified 6,072 company matches for HR outsourcing services associated with the United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

ADP tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most HR outsourcing services?

New York leads with 215 company records, followed by Atlanta (135) and Houston (113).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 69,393 professional contacts with verified work emails tracked across these 6,072 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 26, 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 SmartSearch, 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.