Best PEO Companies in Washington
Compare Professional Employer Organizations serving Washington businesses. All listings are independently reviewed — no paid placements influence our rankings.
PEO Companies Serving Washington
Insperity
IRS CPEO ✓NationwideHQ: Kingwood, TX · Est. 1986
One of the largest PEOs in the United States, Insperity provides HR solutions to over 100,000 businesses. Known for comprehensive benefits access and dedicated HR support teams.
ADP TotalSource
IRS CPEO ✓NationwideHQ: Roseland, NJ · Est. 1996
The PEO division of ADP, one of the world largest payroll and HR companies. Offers deep technology integration and a nationwide service footprint.
TriNet
IRS CPEO ✓NationwideHQ: Dublin, CA · Est. 1988
A publicly traded PEO (NYSE: TNET) specializing in small and medium-sized businesses. Particularly strong in the technology and professional services sectors.
Justworks
IRS CPEO ✓NationwideHQ: New York, NY · Est. 2012
A modern PEO built for startups and growing companies. Known for transparent pricing, intuitive software, and strong health benefits access for smaller teams.
Rippling
NationwideHQ: San Francisco, CA · Est. 2016
A unified HR, IT, and finance platform that offers PEO services. Rippling is known for powerful automation, deep integrations, and a single platform for all workforce management.
Oasis, a Paychex Company
IRS CPEO ✓NationwideHQ: Sarasota, FL · Est. 1996
Part of the Paychex family, Oasis offers the service quality of a boutique PEO with the resources of a Fortune 500 company. Strong in construction and industries with complex workers' comp needs.
Engage PEO
IRS CPEO ✓NationwideHQ: Hollywood, FL · Est. 2011
A nationally recognized PEO offering a high-touch service model with dedicated HR teams. Named one of the fastest-growing PEOs in the country.
Extensis
IRS CPEO ✓NationwideHQ: Union, NJ · Est. 1997
A full-service PEO with a strong reputation in the Northeast. Extensis is known for competitive benefit offerings and responsive service teams.
CoAdvantage
IRS CPEO ✓NationwideHQ: Tampa, FL · Est. 1996
One of the top 10 largest PEOs in the US by employee count. CoAdvantage specializes in small and mid-sized businesses with 5 to 150 employees.
FrankCrum
NationwideHQ: Clearwater, FL · Est. 1981
A family-owned PEO and staffing company based in Florida. FrankCrum is one of the few PEOs with its own insurance company, enabling competitive workers' comp rates.
Infiniti HR
NationwideHQ: Rockville, MD · Est. 2008
A growing national PEO with a focus on nonprofit organizations and government contractors. Infiniti HR offers strong compliance expertise and dedicated service teams.
Choosing a PEO in Washington
Professional Employer Organizations in Washington can help businesses of all sizes manage payroll, benefits, HR compliance, and workers' compensation under a co-employment arrangement. With 54+ providers operating in the state, business owners have a wide range of options — from boutique regional firms with deep local expertise to national providers with broad benefit pools.
When evaluating PEOs in Washington, consider whether the provider is IRS-Certified (CPEO), which offers specific tax advantages and indicates a higher compliance standard. Also review the provider's experience with your specific industry, their client size range, and whether they have dedicated HR professionals assigned to your account.
Use the quote form on this page to receive no-obligation proposals from PEOs that serve Washington businesses matching your size and industry profile.
Frequently Asked Questions
How many PEOs operate in Washington?
There are 54+ Professional Employer Organizations serving businesses in Washington. The number includes both local/regional PEOs and national providers with operations in the state.
Does Washington require PEOs to be licensed?
PEO licensing requirements vary by state. Some states require PEOs to register or obtain a license before operating. We recommend verifying your chosen PEO's compliance status directly or contacting your state's labor department.
What is the average cost of a PEO in Washington?
PEO pricing typically ranges from 2–12% of total payroll, or $100–$200 per employee per month. Costs vary based on company size, services needed, and the specific PEO. Larger companies generally receive better rates.
Should I use a local Washington PEO or a national provider?
National PEOs offer broader benefit pools and more resources, while local PEOs may have deeper knowledge of Washington labor laws and regulations. The best choice depends on your company's size, growth plans, and specific needs.