Company lists · Data refreshed September 2026

Top 25 Human resources outsourcing companies based in the United States

Name: Human resources outsourcing companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 3, 2026 4,436 companies tracked

RevenueBase identified 4,436 company matches for human resources outsourcing companies associated with the United States as of September 2026 and tracks 96,042 professional contacts across them, including 32,160 with verified work emails and 37,115 with mobile numbers. New York is the largest hub.

This list covers company matches for human resources outsourcing companies 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 3, 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 3, 2026 How this list was built

4,436Companies

96,042Contacts tracked

32,160Verified emails

37,115Mobile numbers

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

The 25 largest human resources outsourcing companies based in the United States

Ranked by team size

Top 25 of 4,436 company matches for human resources outsourcing companies based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 3, 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	Paychex	Exact match	Rochester, NY, United StatesHQ recorded Sep 3, 2026	10001+	17,921 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 3, 2026 · View company records in RevenueBase
2	Randstad USA	Exact match	Atlanta, GA, United StatesHQ recorded Sep 3, 2026	1,001-5,000	8,538 contacts →
	Exact match “Randstad North America, Inc.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
3	Insperity	Exact match	Kingwood, TX, United StatesHQ recorded Sep 3, 2026	1,001-5,000	4,818 contacts →
	Exact match “Since 1986, Insperity’s mission has been to help businesses succeed so communities prosper.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
4	Trinet	Exact match	Dublin, CA, United StatesHQ recorded Sep 3, 2026	1,001-5,000	4,102 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 3, 2026 · View company records in RevenueBase
5	GUSTO	Exact match	San Francisco, CO, United StatesHQ recorded Sep 3, 2026	1,001-5,000	3,554 contacts →
	Exact match “Gusto has been growing the small business economy for 15+ years.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
6	Eclaro	Exact match	New York, NY, United StatesHQ recorded Sep 3, 2026	1,001-5,000	1,018 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 3, 2026 · View company records in RevenueBase
7	Zimworx	Exact match	Argyle, TX, United StatesHQ recorded Sep 3, 2026	1,001-5,000	697 contacts →
	Exact match “ZimWorX is a human resources & outsourcing company that helps companies find the best remote employees for their business and field.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
8	HTI	Exact match	Greenville, SC, United StatesHQ recorded Sep 3, 2026	1,001-5,000	546 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 3, 2026 · View company records in RevenueBase
9	HKA Enterprises	Exact match	Duncan, MI, United StatesHQ recorded Sep 3, 2026	1,001-5,000	384 contacts →
	Exact match “One of the most important aspects of any company is its people.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
10	1840 & Company	Exact match	Overland Park, KS, United StatesHQ recorded Sep 3, 2026	1,001-5,000	355 contacts →
	Exact match “1840 & Company is a global staffing and outsourcing partner helping U.S.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
11	Managed Labor Solutions	Exact match	Allentown, PA, United StatesHQ recorded Sep 3, 2026	1,001-5,000	273 contacts →
	Exact match “Managed Labor Solutions (MLS) is a unique provider of outsourced labor to companies large and small.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
12	Staff Boom	Exact match	Anaheim, CA, United StatesHQ recorded Sep 3, 2026	1,001-5,000	241 contacts →
	Exact match “Staff Boom specializes in customized staffing solutions and consulting for small and medium sized businesses to save money and resources, improve how they work and prevent…” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
13	Deploy Hr, INC	Exact match	Pleasanton, CA, United StatesHQ recorded Sep 3, 2026	1,001-5,000	184 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
14	Automatic Data Processing	Exact match	Durham, NC, United StatesHQ recorded Sep 3, 2026	10001+	174 contacts →
	Exact match “ADP is a comprehensive global provider of cloud-based human capital management (HCM) solutions that unite HR, payroll, talent, time, tax and benefits administration, and a leader…” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
15	Heartland Payroll	Exact match	Rochester, OH, United StatesHQ recorded Sep 3, 2026	1,001-5,000	160 contacts →
	Exact match “Ovation Payroll is now Heartland Payroll.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
16	Namely	Exact match	Chandler, AZ, United StatesHQ recorded Sep 3, 2026	1,001-5,000	151 contacts →
	Exact match “Namely is the HR, Payroll, and Benefits platform your employees will love.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
17	Integrity Trade Services	Exact match	Frankfort, IN, United StatesHQ recorded Sep 3, 2026	5,001-10,000	136 contacts →
	Exact match “Integrity Trade Services's core philosophy is "Staffing you can trust".” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
18	Action Group Staffing	Exact match	Tulsa, NJ, United StatesHQ recorded Sep 3, 2026	1,001-5,000	114 contacts →
	Exact match “Action Group Staffing provides recruiting, staffing and complete HR services: Light Industrial Manufacturing & Assembly, Construction & Skilled Trades, Warehouse & Distribution…” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
19	Allsec Technologies Limited	Exact match	Irving, TX, United StatesHQ recorded Sep 3, 2026	1,001-5,000	104 contacts →
	Exact match “Allsec Technologies is a global outsourcing solutions provider, serving over 600 companies in 42+ countries.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
20	Alcott HR	Exact match	Farmingdale, NY, United StatesHQ recorded Sep 3, 2026	5,001-10,000	102 contacts →
	Exact match “At Alcott HR, we have a Passion for People and Performance™.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
21	Infiniti HR	Exact match	Columbia, AZ, United StatesHQ recorded Sep 3, 2026	n/a	89 contacts →
	Exact match “Infiniti HR provides human resources outsourcing services to the small to mid-sized business market, including payroll, human resource compliance, employee benefits services and…” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
22	Congruity HR	Exact match	Winston-salem, FL, United StatesHQ recorded Sep 3, 2026	5,001-10,000	74 contacts →
	Exact match “Welcome to Congruity, where we understand that your people are your most valuable asset.” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
23	Consolidated Staffing Solutions, INC	Exact match	Covina, CA, United StatesHQ recorded Sep 3, 2026	1,001-5,000	74 contacts →
	Exact match “Consolidated Staffing Solutions provides Human Resource Solutions to Companies with demands and requirements of Short Term Placement, Long Term and Permanent Placement, Direct…” Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
24	Resource Management, INC	Exact match	Salt Lake City, WA, United StatesHQ recorded Sep 3, 2026	5,001-10,000	72 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 3, 2026 · View company records in RevenueBase
25	Hospitality Services Group	Exact match	Munster, IN, United StatesHQ recorded Sep 3, 2026	1,001-5,000	70 contacts →
	Exact match “Hospitality Services Group (HSG) is a premier hospitality company that provides a professional staff for the hospitality industry.” Recorded in the RevenueBase company graph · Sep 3, 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 “human resources outsourcing companies”. 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 4,436 human resources outsourcing companies based in the United States

See the full list, filter by size, metro and specialty, and access 32,160 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Human resources outsourcing companies based in the United States at a glance

As of Sep 3, 2026

33.5%Verified-email coverage

38.6%Mobile-number coverage

21.7Average contacts per company

1-10Median size (employees)

2.7%Largest-city concentration · New York

Sep 3, 2026Page data refreshed

Companies by employee count

1-10

2,838

11-50

1,006

51-200

337

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

Freshness & accuracy

How recently the business emails on this list were verified

Email last verified

00–30

2,71331–60

18,27061–90

10,74790–180

430180+

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 “human resources outsourcing companies” 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 32,160 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 3, 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.

Human resources outsourcing companies 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 “human resources outsourcing companies”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many human resources outsourcing companies are there based in the United States?

RevenueBase identified 4,436 company matches for human resources outsourcing companies 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?

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

Which city has the most human resources outsourcing companies?

New York leads with 121 company records, followed by Atlanta (87) and Houston (80).

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 32,160 professional contacts with verified work emails tracked across these 4,436 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 3, 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.