Best PEO Companies in Washington
Compare Professional Employer Organizations serving Washington businesses. Editorial ratings are independent — featured placements are paid visibility, not endorsements.
PEO Companies Serving Washington
Justworks
New York, NY · Est. 2012
Insperity
Kingwood, TX · Est. 1986
TriNet
Dublin, CA · Est. 1988
ADP TotalSource
IRS CPEO ✓NationwideHQ: Roseland, NJ · Est. 1996
ADP TotalSource is the Professional Employer Organization division of ADP (NASDAQ: ADP), one of the world's largest payroll and HR companies with over 75 years of history and more than 1.1 million clients across 140+ cou…
CoAdvantage
IRS CPEO ✓NationwideHQ: Tampa, FL · Est. 1996
CoAdvantage is a Bradenton, Florida-based Professional Employer Organization founded in 1997.
Infiniti HR
NationwideHQ: Rockville, MD · Est. 2008
Infiniti HR is a Burtonsville, Maryland-based IRS CPEO certified Professional Employer Organization founded in 2004.
FrankCrum
NationwideHQ: Clearwater, FL · Est. 1981
A family-owned PEO based in Florida serving businesses nationwide with 2-500 employees. FrankCrum is one of the few PEOs with its own insurance company, enabling highly competitive workers comp rates.
Ambrose Employer Group
RegionalHQ: Los Angeles, CA · Est. 1999
A California-focused PEO with deep expertise in the state's complex employment laws. Ambrose specializes in entertainment and technology companies navigating California compliance.
PrestigePEO
IRS CPEO ✓NationwideHQ: Melville, NY · Est. 1998
PrestigePEO is a national Professional Employer Organization headquartered in Melville, New York, serving small and mid-sized businesses across all 50 states since 1998.
Northwest PEO
IRS CPEO ✓RegionalHQ: Seattle, WA · Est. 1999
A Seattle-based PEO serving the Pacific Northwest. Northwest PEO has deep expertise in Washington state employment law and the technology sector.
OnePoint HRO
IRS CPEO ✓RegionalHQ: Englewood, CO · Est. 2005
OnePoint HRO is an Englewood, Colorado-based IRS CPEO certified Professional Employer Organization founded in 1999.
Optimum Employer Solutions
IRS CPEO ✓RegionalHQ: Santa Ana, CA · Est. 2012
Optimum Employer Solutions is a Southern California-based IRS CPEO certified Professional Employer Organization serving small to mid-sized businesses across the United States.
Sequoia One PEO
IRS CPEO ✓RegionalHQ: Tempe, AZ · Est. 2012
Sequoia One PEO is a Tempe, Arizona-based IRS CPEO certified and ESAC accredited Professional Employer Organization founded in 2018, operating as part of Sequoia Consulting Group.
IntelliPro
IRS CPEO ✓NationwideHQ: San Jose, CA · Est. 2009
IntelliPro is an IRS-certified PEO headquartered in San Jose, California, specializing in HR outsourcing, payroll administration, and employee benefits management for technology companies and professional services firms…
Paychex PEO
IRS CPEO ✓NationwideHQ: Rochester, NY · Est. 1971
Paychex PEO is the co-employment division of Paychex (NASDAQ: PAYX), one of the largest HR and payroll companies in the United States with over 50 years of experience serving American businesses.
BBSI
NationwideHQ: Vancouver, WA · Est. 1965
Barrett Business Services, Inc. (BBSI) is a publicly traded (NASDAQ: BBSI) Professional Employer Organization headquartered in Vancouver, Washington.
Adams Keegan
IRS CPEO ✓NationwideHQ: Memphis, TN · Est. 1987
Adams Keegan is a Memphis, Tennessee-based PEO offering both co-employment (PEO) and administrative services organization (ASO) models.
Deel PEO
NationwideHQ: San Francisco, CA · Est. 2019
Deel PEO is the domestic U.S. co-employment offering from Deel, a San Francisco-based global HR and payroll platform founded in 2019 and valued at $16.8 billion following a $450 million Series G in May 2025.
AlphaStaff
NationwideHQ: Sunrise, FL · Est. 1997
AlphaStaff is a Sunrise, Florida-based Professional Employer Organization founded in 1997 and ESAC accredited.
Vensure Employer Services
NationwideHQ: Chandler, AZ · Est. 2004
Vensure Employer Services is one of the largest privately held PEOs in the United States, headquartered in Chandler, Arizona, and founded in 2004.
America's Back Office
IRS CPEO ✓NationwideHQ: Chandler, AZ · Est. 2000
America's Back Office is an IRS CPEO certified and ESAC accredited PEO headquartered in Chandler, Arizona, providing comprehensive HR outsourcing services to small and mid-sized businesses across the United States.
Avitus Group
NationwideHQ: Billings, MT · Est. 1994
Avitus Group is a Billings, Montana-based PEO and HR outsourcing company founded in 1994, providing payroll processing, employee benefits, workers' compensation, and HR services to businesses nationwide.
Modern Business Associates
NationwideHQ: Tampa, FL · Est. 1990
Modern Business Associates (MBA) is a Tampa, Florida-based PEO founded in 1990, providing co-employment services including payroll processing, employee benefits, HR administration, workers' compensation, and compliance s…
Simploy
RegionalHQ: Boise, ID · Est. 2008
Simploy is a Boise, Idaho-based PEO providing co-employment services including payroll, employee benefits, HR administration, workers' compensation, and compliance support to small and mid-sized businesses across the Mou…
Proservice National
NationwideHQ: Honolulu, HI · Est. 2010
Proservice National is the mainland U.S. PEO extension of ProService Hawaii, providing co-employment services including payroll, benefits, HR administration, and compliance support to businesses across the continental Un…
Questco
NationwideHQ: The Woodlands, TX · Est. 2002
Questco is a national PEO headquartered in The Woodlands, Texas, providing comprehensive co-employment services to businesses across the United States.
Regis HR Group
NationwideHQ: Tampa, FL · Est. 2002
Regis HR Group is a Tampa, Florida-based national PEO providing co-employment services including payroll processing, employee benefits, HR administration, workers' compensation, and compliance support to businesses acros…
Stratus HR
NationwideHQ: South Jordan, UT · Est. 2003
Stratus HR is a South Jordan, Utah-based PEO (operating as ISI HR) providing comprehensive co-employment services to small and mid-sized businesses nationwide.
Tilson HR
RegionalHQ: Portland, OR · Est. 1999
Tilson HR is a Portland, Oregon-based PEO founded in 1999, providing payroll, employee benefits, HR administration, and compliance services to growing businesses across the Pacific Northwest and Western United States.
Xenium HR
RegionalHQ: Hillsboro, OR · Est. 1996
Xenium HR is a Hillsboro, Oregon-based PEO founded in 1996, serving small and mid-sized businesses in the Pacific Northwest.
True PEO
RegionalHQ: Scottsdale, AZ · Est. 2008
True PEO is a Scottsdale, Arizona-based Professional Employer Organization providing payroll, employee benefits, HR administration, and compliance services to small and mid-sized businesses in the Southwest and Western U…
INVO PEO
NationwideHQ: Tampa, FL · Est. 2010
INVO PEO is a Tampa, Florida-based Professional Employer Organization providing co-employment services including payroll processing, employee benefits, HR administration, workers' compensation, and compliance support to…
SinglePoint Outsourcing
NationwideHQ: Scottsdale, AZ · Est. 2007
SinglePoint Outsourcing is a Scottsdale, Arizona-based PEO providing national co-employment services including payroll, employee benefits, HR administration, and compliance support to small and mid-sized businesses acros…
Saltus
RegionalHQ: Las Vegas, NV · Est. 2012
Saltus is a Las Vegas, Nevada-based PEO providing co-employment services including payroll, employee benefits, HR administration, and compliance support to businesses in Nevada and surrounding Western states, with notabl…
NetPEO
NationwideHQ: Atlanta, GA · Est. 2009
NetPEO is an Atlanta, Georgia-based PEO broker and provider offering co-employment services and PEO matching to businesses nationwide.
Total HR
RegionalHQ: San Diego, CA · Est. 2006
Total HR is a San Diego, California-based PEO (operating as Strategic HR Management Services) providing comprehensive co-employment services including payroll, employee benefits, HR administration, and compliance support…
PrimePay
NationwideHQ: West Chester, PA · Est. 1986
PrimePay is a West Chester, Pennsylvania-based payroll and PEO services company founded in 1986, providing co-employment services and payroll administration to small and mid-sized businesses nationwide.
CPE HR
RegionalHQ: Burbank, CA · Est. 2003
CPE HR is a Burbank, California-based PEO providing co-employment services to businesses primarily in California and nationally.
Summit HR
RegionalHQ: Salt Lake City, UT · Est. 2004
Summit HR is a Salt Lake City, Utah-based PEO providing co-employment services to businesses across the Mountain West.
Pinnacle PEO
RegionalHQ: Scottsdale, AZ · Est. 2005
Pinnacle PEO is a Scottsdale, Arizona-based Professional Employer Organization providing co-employment services including payroll processing, employee benefits, HR administration, and compliance support to businesses acr…
Prism HR
NationwideHQ: Hopkinton, MA · Est. 1996
PrismHR is a Hopkinton, Massachusetts-based HR technology platform and PEO services provider founded in 1996.
Choosing a PEO in Washington
Washington State has one of the most employee-protective legal frameworks in the country, anchored by a minimum wage of $17.13 per hour — among the highest in the nation. Washington has no state income tax, but its regulatory environment is sophisticated and fast-evolving. Pay transparency is required, with employers posting salary ranges in job listings, and the state's Washington Fair Chance Act was expanded in 2026 to further restrict employers from using criminal records in hiring decisions, with specific notice requirements for affected applicants.
Washington's Paid Family and Medical Leave (PFML) program is one of the most comprehensive in the country. Employees can take up to 12 weeks of paid leave per year for family or medical reasons, funded through employee and employer premiums. The 2026 premium rate is 1.13% of gross wages, with employers paying 28.57% of that amount for businesses with 50 or more employees. Effective January 1, 2026, job protection for PFML now applies to employers with 25 or more employees, expanding from the prior 50-employee threshold — and this threshold continues to decrease in coming years.
Washington requires employers to provide paid sick leave to most employees, accruing at 1 hour per 40 hours worked with no cap on accrual. Workers' compensation is mandatory and administered through the Washington State Department of Labor and Industries (L&I), a state fund that employers must participate in — similar to Ohio's monopolistic system. Washington also extended unemployment insurance to striking workers beginning in 2026, a significant development for businesses in industries with active labor relations.
Washington's economy is anchored by technology, aerospace, agriculture, and maritime industries — all with demanding HR requirements. The Seattle and Puget Sound area in particular has one of the most competitive labor markets in the country, where benefits and compensation packages are closely scrutinized by job seekers. A PEO with Washington State expertise can help businesses manage PFML administration, L&I workers' comp, pay transparency compliance, and the full range of state-specific HR requirements. Use the form on this page to connect with qualified PEOs serving Washington businesses.
Already working with a PEO and considering a switch? PEO Alternatives has independent comparisons of the top providers to help you evaluate your options.
Frequently Asked Questions
What is the minimum wage in Washington State in 2026?
Washington's statewide minimum wage is $17.13 per hour as of 2026, adjusted annually. Seattle and other Washington cities may set higher local minimum wages. Employers must comply with whichever rate — state or local — is higher for each employee's work location. Washington's minimum wage is among the highest in the nation.
How does Washington's Paid Family and Medical Leave program work?
Washington's PFML program provides employees with up to 12 weeks of paid leave per year for family or medical reasons, funded through premiums of 1.13% of gross wages in 2026. Employers with 50 or more employees pay 28.57% of the premium, with employees paying the remainder. Effective 2026, job protection applies to employers with 25 or more employees. A PEO can manage premium collection and PFML administration on your behalf.
How does workers' compensation work in Washington State?
Washington has a state-administered workers' compensation system through the Department of Labor and Industries (L&I). Most employers must participate in the L&I system rather than purchasing coverage from a private insurer, though some large employers qualify for self-insurance. A PEO experienced with Washington's L&I system can manage workers' comp premiums, claims, and reporting requirements.
Does Washington require paid sick leave?
Yes. Washington requires most employers to provide paid sick leave accruing at 1 hour per 40 hours worked, with no cap on accrual during the year. Employers may frontload at least 40 hours of sick leave at the start of each year instead of using accrual. Sick leave can be used for the employee's own illness or injury or to care for a qualifying family member.