Company lists · Data refreshed September 2026

Top 25 Payroll processing staffing based in the United States

RevenueBase identified 964 payroll processing staffing headquartered in the United States as of September 2026 and tracks 102,728 professional contacts across them, including 36,755 with verified work emails and 27,196 with mobile numbers. Houston is the largest hub.

This list covers payroll processing staffing 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.

How to read this list HQ checked on every row Match evidence on every row Refreshed Sep 5, 2026 86% judged on-target in blind review
964Companies
102,728Contacts tracked
36,755Verified emails
27,196Mobile numbers
Unlock all 964 companies Free signup · no credit card · 500 free credits

The 25 largest payroll processing staffing based in the United States

Ranked by team size
Top 25 of 964 payroll processing staffing based in the United States, ranked by team size, largest first. Data refreshed Sep 5, 2026. Evidence rates how directly each company's own description names payroll processing staffing: strong (names it), partial (names part of it), indirect (matched on its full profile rather than the summary shown). Click a count to unlock that company's people.
#CompanyHeadquartersEmployeesContacts
1
ADPIndirect evidence
Roseland, NJ, United StatesHQ checked Sep 5, 202610001+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, 2026
2
GUSTOIndirect evidence
San Francisco, CA, United StatesHQ checked Sep 5, 20261,001-5,0003,543

“Gusto has been growing the small business economy for 15+ years.”

Source: company website · checked Sep 5, 2026
3
CoadvantageIndirect evidence
Bradenton, FL, United StatesHQ checked Sep 5, 2026201-500586

“CoAdvantage is now CoAd.”

Source: company website · checked Sep 5, 2026
4Richfield, OH, United StatesHQ checked Sep 5, 2026501-1,000535

“We provide comprehensive HR solutions to companies of all sizes throughout the United States.”

Source: company website · checked Sep 5, 2026
5
MMC Group LPStrong evidence
Irving, TX, United StatesHQ checked Sep 5, 202651-200496

“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: company website · checked Sep 5, 2026
6
Vistra IipayPartial evidence
Dallas, TX, United StatesHQ checked Sep 5, 20265,001-10,000323

“Together Vistra + iiPay are building the world's most powerful payroll proposition.”

Source: company website · checked Sep 5, 2026
7
Experian Employer ServicesIndirect evidence
Costa Mesa, CA, United StatesHQ checked Sep 5, 2026501-1,000291

“Employers need a partner they can rely on to face today’s new challenges.”

Source: company website · checked Sep 5, 2026
8
SurepayrollPartial evidence
Rochester, NY, United StatesHQ checked Sep 5, 2026201-500276

“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, 2026
9
INOVAPartial evidence
Nashville, TN, United StatesHQ checked Sep 5, 2026201-500271

“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, 2026
10San Diego, CA, United StatesHQ checked Sep 5, 202651-200213

“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, 2026
11
Tempworks Software, INCPartial evidence
Bloomington, MN, United StatesHQ checked Sep 5, 202651-200209

“As a seamless staffing software provider, TempWorks develops customized solutions from the ground up to address your staffing needs.”

Source: company website · checked Sep 5, 2026
12
Dominion PayrollPartial evidence
Richmond, VA, United StatesHQ checked Sep 5, 202651-200197

“Dominion Payroll is a leader in payroll and human resource solutions for clients nationwide.”

Source: company website · checked Sep 5, 2026
13
Staffing SolutionsPartial evidence
Santa Ana, CA, United StatesHQ checked Sep 5, 2026201-500192

Staffing Solutions goal is to consistently provide our clients with value added service which will enable them to achieve the highest level of success and profitability.”

Source: company website · checked Sep 5, 2026
14
Maxonic INCIndirect evidence
Campbell, CA, United StatesHQ checked Sep 5, 2026201-500191

“Maxonic, Inc.”

Source: company website · checked Sep 5, 2026
15
APS PayrollPartial evidence
Shreveport, LA, United StatesHQ checked Sep 5, 2026201-500189

“At APS, our mission is simple: to make payroll and HR easier.”

Source: company website · checked Sep 5, 2026
16
Advance PartnersPartial evidence
Highland Hills, OH, United StatesHQ checked Sep 5, 202651-200175

“Most Innovative Payroll Financial Services Provider"(2022)(2023)"Top Workplaces"(2024)"Financial Services Provider of the Year"(2022)(2023)(2024)"Best Payroll Funding…”

Source: company website · checked Sep 5, 2026
17
Heartland PayrollPartial evidence
Rochester, NY, United StatesHQ checked Sep 5, 20261,001-5,000159

“Ovation Payroll is now Heartland Payroll.”

Source: company website · checked Sep 5, 2026
18
Greenshades SoftwareIndirect evidence
Jacksonville, FL, United StatesHQ checked Sep 5, 2026201-500155

“Greenshades delivers purpose-built workforce management solutions for organizations where workforce complexity is the norm, not the exception.”

Source: company website · checked Sep 5, 2026
19Mansfield, MA, United StatesHQ checked Sep 5, 2026201-500155

“ConnectPay empowers small businesses across America through hassle-free payroll processing.”

Source: company website · checked Sep 5, 2026
20
Payroll VaultPartial evidence
Littleton, CO, United StatesHQ checked Sep 5, 202611-50149

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, 2026
21
Integrity Trade ServicesPartial evidence
Frankfort, IL, United StatesHQ checked Sep 5, 20265,001-10,000134

“Integrity Trade Services's core philosophy is "Staffing you can trust".”

Source: company website · checked Sep 5, 2026
22Peachtree Corners, GA, United StatesHQ checked Sep 5, 202651-200126

“At Corporate Payroll Services, we relieve you of the burden of processing payroll.”

Source: company website · checked Sep 5, 2026
23
Niural AIPartial evidence
New York, NY, United StatesHQ checked Sep 5, 202651-200125

“US payroll, EOR, Contractor Management and Global Bill Pay in one platform for a global workforce.”

Source: company website · checked Sep 5, 2026
24
CHECKPartial evidence
New York, CA, United StatesHQ checked Sep 5, 202651-200124

“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, 2026
25
Avitus GroupPartial evidence
Billings, MT, United StatesHQ checked Sep 5, 2026201-500123

“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, 2026

Showing 25 of 964 payroll processing staffing based in the United States

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Payroll processing staffing based in the United States at a glance

As of Sep 5, 2026
11-50Median size (employees)
HoustonLargest hub · 20 HQs
27,196Contacts with mobile numbers
Sep 5, 2026Data refreshed

Companies by employee count

1-10
472
11-50
321
51-200
105
201-500
24
501-1,000
15
1,001-5,000
16
5,001-10,000
4
10001+
2

Verified emails by last verification

0–30
33,976
31–60
2,318
61–90
19
90–180
25
180+
417

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 staffing, 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 staffing”. 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 staffing, 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, 36,755 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 staffing are there based in the United States?

RevenueBase identified 964 payroll processing staffing 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 staffing?

Houston leads with 20 headquartered companies, followed by New York (18) and Atlanta (11).

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 36,755 verified decision-maker contacts tracked across these 964 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.