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City Government Services
| Alligator's Creek Aquatic Center | 636-272-1626 |
| City Hall | 636-240-2000 |
| Citizens First Center | 636-379-5553 |
| Municipal Court | 636-240-8766 |
| Parks and Recreation | 636-474-2732 |
| Trash and Recycling Collection | 636-272-0477 |
| Renaud Center | 636-474-2732 |
| St. Charles County Government | 636-949-7900 |
| St. Charles County Library District | 636-441-2300 |
| Senior Center | 636-272-4180 |
| Streets | 636-379-3807 |
| Venues & Weddings | 636-379-3288 |
| Volunteer Services | 636-379-5417 |
| Water and Sewer | 636-281-2858 |
Public Education Districts
| Fort Zumwalt School District | 636-240-2072 |
| Francis Howell School District | 636-851-4000 |
| Wentzville School District | 636-327-3800 |
Emergency Services
In the event of an emergency, always dial 9-1-1.
| O'Fallon Police Department (Non-emergency) | 636-240-3200 |
| O'Fallon PD Animal Control | 636-240-3200 |
| O’Fallon Fire Protection District | 636- |
| Central County Fire & Rescue | 636-447-6655 |
| Cottleville Fire Protection District | 636-447-6655 |
| Lake Saint Louis Fire Protection District | 636-561-9200 |
| New Melle Fire Protection District | 636-828-5528 |
| Wentzville Fire Protection District | 636-327-6334 |
| St. Charles County Ambulance District | 636-344-7600 |
Miscellaneous
| EDC of St. Charles County | 636-441-6880 |
| Greater St. Charles Convention & Visitors Bureau | 636-366-2427 |
| MO Rides | 844-836-7433 |
| O’Fallon Chamber of Commerce & Industries | 636-240-1818 |
| St. Charles County Election Authority | 844-836-7433 |
| St. Charles County Recycle Works | 636-949-7900 |
Public Utilities
| City of O'Fallon Water and Sewer | 636-281-2858 |
| Cuivre River Electric | 636-695-4700 |
| Duckett Creek Sanitary District | 636-441-1244 |
| Duckett Creek Emergency | 636-447-4944 |
| Missouri American Water | 866-430-0820 |
| Public Water Supply District No. 2 | 636-326-3200 |
| Spire | 800-887-4173 |
| Spire Emergency | 314-342-0800 |
Veterans
| American Legion Post 388 | 636-219-0553 |
| AMVETS Post 106 | 636-397-1660 |
| St. Charles County Marine Corps League Detachment 725 | 314-670-0433 |
| O'Fallon Veterans Assistance Office (inside City Hall) | 636-379-5577 |
| St. Charles County Veterans Museum | 636-294-2657 |
| Vietnam Veterans of America Post 458 | 636-441-2188 |
| VFW Post 5077 | 636-272-1945 |