| Impact Outsourcing Solutions | Impact Outsourcing Solutions VII, LLC | 1475 S. Price Road | |
| InfinitiHR | InfinitiHR | 3905 National Dr, Suite 230 | infinitihr.com |
| 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 |
