| Business | Phone |
| Automatic Data Processing 2979 Triverton Pike Dr, Madison 53711 | (608) 275-6700 |
| Paychex Inc 8413 Excelsior Dr, Madison 53717 | (608) 827-3100 |
| Payroll Co Inc 2110 Luann Ln, Madison 53713 | (608) 268-2930 |
| Payroll Data Svc Llc 2418 Crossroads Dr, Madison 53718 | (608) 249-5886 |