Company lists · Data refreshed September 2026
Top 25 Payroll processing outsourcing companies based in the United States
RevenueBase identified 1,012 payroll processing outsourcing companies headquartered in the United States as of September 2026 and tracks 100,783 professional contacts across them, including 36,583 with verified work emails and 26,644 with mobile numbers. New York is the largest hub.
This list covers payroll processing 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, how directly it supports the match, and when it was last checked. Data refreshed September 5, 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.
The 25 largest payroll processing outsourcing companies based in the United States
Ranked by team size| # | Company | Contacts | |||
|---|---|---|---|---|---|
| 1 | 84,166 | ||||
“Designing better ways to work through cutting-edge products, premium services and exceptional experiences that enable people to reach their full potential.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 2 | 3,543 | ||||
“Gusto has been growing the small business economy for 15+ years.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 3 | 586 | ||||
“CoAdvantage is now CoAd.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 4 | 535 | ||||
“We provide comprehensive HR solutions to companies of all sizes throughout the United States.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 5 | 436 | ||||
“PrismHR creates exceptional software and services, empowering human resource outsourcing service providers such as Professional Employer Organizations (PEOs) and HR outsourcers to…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 6 | 291 | ||||
“Employers need a partner they can rely on to face today’s new challenges.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 7 | Questco CompaniesPartial evidence | 279 | |||
“Outsourcing HR through a PEO is a strong option for growing businesses.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 8 | 276 | ||||
“From start-up to scale-up, SurePayroll online payroll, tax management, HR and benefits solutions give small business and household employers the freedom to succeed.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 9 | 271 | ||||
“Inova Payroll is a leading employer services company, integrating payroll and human capital management (HCM) technology with personalized support and full-service HR outsourcing.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 10 | Team Risk Management StrategiesPartial evidence | 213 | |||
“TEAM Risk Management Strategies is the nation’s leading provider of comprehensive, outsourced payroll and human resources services for fiduciaries and advisors whose clients have…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 11 | 197 | ||||
“Dominion Payroll is a leader in payroll and human resource solutions for clients nationwide.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 12 | 189 | ||||
“At APS, our mission is simple: to make payroll and HR easier.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 13 | 159 | ||||
“Ovation Payroll is now Heartland Payroll.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 14 | 155 | ||||
“Greenshades delivers purpose-built workforce management solutions for organizations where workforce complexity is the norm, not the exception.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 15 | 155 | ||||
“ConnectPay empowers small businesses across America through hassle-free payroll processing.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 16 | Payroll VaultPartial evidence | 149 | |||
“Payroll Vault has Re-Defined Payroll Payroll Vault is a nationally leading vendor that is re-defining the payroll industry with advanced cloud-based technologies, the highest…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 17 | 126 | ||||
“At Corporate Payroll Services, we relieve you of the burden of processing payroll.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 18 | 125 | ||||
“US payroll, EOR, Contractor Management and Global Bill Pay in one platform for a global workforce.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 19 | 124 | ||||
“Check is a payroll-as-a-service API that lets you embed payroll directly in your vertical SaaS, HR, or time-tracking platform.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 20 | 123 | ||||
“Avitus Group is a worldwide company that simplifies, strengthens and grows businesses by providing administrative support (Payroll, accounting, taxes, HR and much more.) When a…” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 21 | 117 | ||||
“We source & screen worldwide talent, hire them on your behalf, consolidate payroll & compliance, and provide stellar onboarding support.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 22 | 116 | ||||
“UZIO | UZIO.ai Empowering People.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 23 | 113 | ||||
“HR starts with human.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 24 | 101 | ||||
“Complete Payroll, HR Services, Insurance Services, Retirement Plan Services and Workforce Management Solutions.” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
| 25 | Zuma Payroll And HRPartial evidence | 89 | |||
“Payroll and HR” Source: company website · checked Sep 5, 2026Thanks. The Data Team will review it. | |||||
Showing 25 of 1,012 payroll processing outsourcing companies based in the United States
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Payroll processing outsourcing companies based in the United States at a glance
As of Sep 5, 2026Companies by employee count
Verified emails by last verification
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 payroll processing outsourcing companies, so some rows will be adjacent to the category rather than pure plays. The description and evidence 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 SmartSearch, 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 “payroll processing outsourcing companies”. Matching reads each company's description, not its industry code or its name.
- What we exclude
- Companies whose own description does not clearly place them among payroll processing 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 an evidence 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, 36,583 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 5, 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.
Frequently asked
How many payroll processing outsourcing companies are there based in the United States?
RevenueBase identified 1,012 payroll processing 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 payroll processing outsourcing companies?
New York leads with 21 headquartered companies, followed by Houston (14) and Los Angeles (12).
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 36,583 verified decision-maker contacts tracked across these 1,012 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 5, 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.
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