Company lists · Data refreshed September 2026
Top 25 HR and payroll outsourcing companies based in the United States
RevenueBase identified 3,767 HR and payroll outsourcing companies headquartered in the United States as of September 2026 and tracks 175,397 professional contacts across them, including 63,613 with verified work emails. New York is the largest hub.
This list covers HR and payroll outsourcing companies 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.
The 25 largest HR and payroll outsourcing companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 84,166 contacts → | ||||
Indirect evidence “Designing better ways to work through cutting-edge products, premium services and exceptional experiences that enable people to reach their full potential.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 2 | 17,911 contacts → | ||||
Strong evidence “As the future of work continues to evolve, Paychex leads the way by making complex HR, payroll, and benefits brilliantly simple.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 3 | 4,761 contacts → | ||||
Indirect evidence “Since 1986, Insperity’s mission has been to help businesses succeed so communities prosper.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 4 | 4,056 contacts → | ||||
Partial evidence “TriNet (NYSE: TNET) provides small and medium-size businesses (SMBs) with full-service HR solutions tailored by industry.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 5 | 3,543 contacts → | ||||
Indirect evidence “Gusto has been growing the small business economy for 15+ years.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 6 | 2,437 contacts → | ||||
Partial evidence “VensureHR is the direct employer services business unit of Vensure Employer Solutions, the largest privately held organization in the HR technology and services sector, delivering…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 7 | 1,591 contacts → | ||||
Indirect evidence “We started as a staffing company in 1972, and over the past 50 years, evolved into a Professional Employer Organization or PEO.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 8 | 1,554 contacts → | ||||
Indirect evidence “Justworks takes the busyness out of growing a business and alleviates the unknown.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 9 | 1,376 contacts → | ||||
Indirect evidence “Employee Based Systems (EBS) is a innovative HRMS software development, implementation training, support, and services company specializing in helping companies improve…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 10 | 1,182 contacts → | ||||
Strong evidence “Keka is a leading unified HR and payroll platform that helps organizations run people operations with consistency, compliance, and operational clarity.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 11 | 840 contacts → | ||||
Strong evidence “Managing HR, payroll, benefits, and compliance can stretch your team thin, and mistakes are costly.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 12 | 828 contacts → | ||||
Indirect evidence “Oasis, A Paychex Company, is a leading Professional Employer Organization (PEO).” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 13 | 816 contacts → | ||||
Partial evidence “OneSource Virtual (OSV) delivers patented in-tenant technology and expert services that efficiently automate the administrative, transactional tasks of Workday payroll, taxes…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 14 | 701 contacts → | ||||
Partial evidence “Trusted by more than 1 million companies, Mineral is the HR and compliance leader for growing businesses.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 15 | 665 contacts → | ||||
Indirect evidence “Asure (NASDAQ: ASUR) sees Human Capital Management (HCM) through the lens of entrepreneurs and executives with an owner’s mentality.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 16 | 655 contacts → | ||||
Strong evidence “Since AccountantsWorld By IRIS is a leader in providing HR and payroll software for accountants and CPA firms.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 17 | 586 contacts → | ||||
Indirect evidence “CoAdvantage is now CoAd.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 18 | 580 contacts → | ||||
Indirect evidence “Atlas HXM understands how people work.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 19 | 535 contacts → | ||||
Partial evidence “We provide comprehensive HR solutions to companies of all sizes throughout the United States.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 20 | 525 contacts → | ||||
Indirect evidence “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.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 21 | 496 contacts → | ||||
Partial evidence “For over 35 years, MMC has been a trusted leader in Staffing and Payroll solutions, serving the private, public, and federal sectors with unparalleled excellence.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 22 | 436 contacts → | ||||
Strong evidence “PrismHR creates exceptional software and services, empowering human resource outsourcing service providers such as Professional Employer Organizations (PEOs) and HR outsourcers to…” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 23 | 421 contacts → | ||||
Partial evidence “ProService Hawaii provides bundled HR solutions that make it easier for employers to succeed.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 24 | 383 contacts → | ||||
Strong evidence “FrankCrum offers outsourced HR, payroll and payroll administration, employee benefits and benefits administration, 401(k), workers compensation and HR Solutions.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
| 25 | 381 contacts → | ||||
Strong evidence “Headway Workforce Solutions is a leading B2B (Business to Business) provider of HR Administration Outsourcing and Talent Solutions.” Source: RevenueBase Database · checked Sep 21, 2026Thanks. The Data Team will review it. | |||||
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: HR and payroll outsourcing companies. 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 HR and payroll outsourcing companies.
- Partial evidence
- Its own public description names part of HR and payroll outsourcing companies, so it works in or next to the category without describing itself that way.
- Indirect evidence
- The description shown does not name HR and payroll outsourcing companies. 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 3,767 HR and payroll outsourcing companies based in the United States
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HR and payroll outsourcing companies based in the United States at a glance
As of Sep 21, 2026Companies by employee count
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 3,767 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 HR and payroll outsourcing companies, 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 “HR and payroll outsourcing companies”. 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 HR and payroll outsourcing companies), 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 HR and payroll outsourcing companies, 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, 63,613 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.
HR and payroll outsourcing companies by metro
- HR and payroll outsourcing companies in New York76
- HR and payroll outsourcing companies in Houston65
- HR and payroll outsourcing companies in Atlanta62
- HR and payroll outsourcing companies in Los Angeles49
- HR and payroll outsourcing companies in Miami48
- HR and payroll outsourcing companies in Tampa43
- HR and payroll outsourcing companies in Denver41
- HR and payroll outsourcing companies in Chicago38
- HR and payroll outsourcing companies in Dallas36
- HR and payroll outsourcing companies in San Francisco36
- HR and payroll outsourcing companies in Austin35
- HR and payroll outsourcing companies in Phoenix34
- HR and payroll outsourcing companies in San Diego32
- HR and payroll outsourcing companies in Charlotte25
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 HR and payroll outsourcing companies, 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 HR and payroll outsourcing companies are there based in the United States?
RevenueBase identified 3,767 HR and payroll outsourcing companies 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?
ADP, headquartered in Roseland, tops this list with the largest team on record.
Which city has the most HR and payroll outsourcing companies?
New York leads with 76 headquartered companies, followed by Houston (65) and Atlanta (62).
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 63,613 verified decision-maker contacts tracked across these 3,767 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.
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