| Alton Chamber of Commerce | 417-778-6321 |
| Alton City Hall | 417-778-6321 |
| Alton Fire Department | 417-778-6161 |
| Alton Housing Authority | 417-778-6564 |
| Alton Ministerial Alliance | 417-778-6903 or 417-778-6266 |
| Alton Multipurpose Senior Center | 417-778-7342 |
| Alton Police Department | 417-778-7115 |
| Alton Public Schools (The Alton Comets) | 417-778-7215 & 7217 |
| Alton Public Library | 417-778-6414 |
| Alton Waste Water Treatment Plant | 417-778-7696 |
| County Clerk | 417-778-7475 |
| County Collector | 417-778-7495 |
| County Coroner | 417-778-7221 |
| County Court Presiding Commissioner | 417-778-6505 |
| County Prosecuting Attorney | 417-778-7616 |
| County Public Administrator | 417-778-7780 |
| County Treasurer | 417-778-6303 |
| Oregon County Ambulance–Alton | 888-404-7813 |
| Oregon County Ambulance Emergency | 417-264-7228 |
| Oregon County Recycling Association | 417-264-7235 |
| Oregon County Sheriff's Department | 417-778-6611 |
| University of Missouri Extension Center | 417-778-7490 |
| Oregon County Genealogy Society (in the library) | 417-778-6414 |
| Richardson's Trash | 417-778-6216 |
| GWFC Alton Culture Club | 417-778-6154 |