| Business | Phone |
| St Charles County Sheriff's 101 Crossings Industrial Ct, O Fallon 63366 | (636) 949-0809 |
| Sheriff's Dept-Detective Div 101 Crossings Industrial Ct, O Fallon 63366 | (636) 949-3020 |
| Sheriff's Dept-Forensic Svc 101 Crossings Industrial Ct, O Fallon 63366 | (636) 949-3013 |
| Sheriff's Dept-In-House Offcr 101 Crossings Industrial Ct, O Fallon 63366 | (636) 949-3000 |
| Sheriff's Dept-Patrol Div 101 Crossings Industrial Ct, O Fallon 63366 | (636) 949-3030 |
| Sheriff's Dept-Records Div 101 Crossings Industrial Ct, O Fallon 63366 | (636) 949-3016 |