| Innoworks Employment Services | Innoworks Employment Services, Inc | 146 North St Suite 3 | |
| Insperity | Insperity | 19001 Crescent Springs Dr | insperity.com |
| InTandem HR | InTandem HR | 1776 S Jackson St, Suite 212 | intandemhr.com |
| Integrity Employee Leasing | Integrity Employee Leasing | 128 W Charlotte Ave | integrityel.com |
| Integrity Outsource | Integrity Outsource | 10429 S 51st St, Suite 205 | integrityoutsource.com |
| Justworks | Justworks | 55 Water St, Ste 400 | justworks.com |
| Keena | KEENA PEO II, Inc. | 2 Progress Blvd | |
| LandrumHR | LandrumHR | 219 E Garden St, Suite 500 | landruminc.com |
| LBMC Employment Partners | LBMC Employment Partners | 201 Franklin Rd, Suite 201 | lbmcep.com |
| Lever1 | Lever1 | 5700 W. 112th St, Suite 230 | lever1.com |
| Lightsource PEO | Lightsource PEO | 1475 S Price Rd | lightsourcepeo.com |
| Logan Payroll Systems, Inc | Logan Payroll Systems, Inc | 9714 Atlantic Ave | |
| Lyons HR | Lyons HR | 431 Broad St | clearlyrated.com |
| MedBest | MedBest Medical Management, Inc. | 251 Salina Meadows Parkway, Suite 100 | |
| MedHQ | MedHQ | 4 Westbrook Corporate Center, Suite 430 | medhq.com |
| Medical Arts Office Services, Inc. | Medical Arts Office Services, Inc. | — | |
| MidwestHR | MidwestHR | 631 E Boughton Rd, Suite 300 | midwesthr.com |
| My HR Professionals | My HR Professionals | 902 South 21st Street | myhrprofessionals.com |
| Nextep | Nextep | 1800 N Interstate Dr | nextep.com |
| Paychex PEO | Paychex (PEO, formerly Oasis) | 2054 Vista Pkwy, Suite 300 | paychex.com |
| Payroll Office of America | Payroll Office of America (POA) | 8647 Baypine Rd, Suite 200 | payrollofficeofamerica.com |
| PRemployer | PRemployer, Inc. | 201 S Oates St | premployerinc.com |
| PrestigePEO | PrestigePEO | 538 Broadhollow Rd, Suite 311 | prestigepeo.com |
| Propel HR | Propel HR | 1200 Woodruff Rd, Building A-3 | propelhr.com |
| ProService Hawaii | ProService Hawaii | 6600 Kalanianaole Hwy, Suite 200 | proservice.com |
