| Business | Phone |
| Cable Tv 200 N 2nd St # 403, St Charles 63301 | (636) 949-3288 |
| Wapelhorst Concession 1875 Muegge Rd, St Charles 63303 | (636) 447-7569 |
| Water Division-Distribution 3600 Elm Point Rd, St Charles 63301 | (636) 949-3550 |
| St Charles City Administrator 200 N 2nd St # 300, St Charles 63301 | (636) 949-3262 |
| St Charles City Facilities 200 N 2nd St, St Charles 63301 | (636) 949-3200 |
| St Charles Elevator Inspctns 200 N 2nd St, St Charles 63301 | (636) 949-3206 |
| St Charles Human Resources 200 N 2nd St, St Charles 63301 | (636) 949-3232 |
| St Charles Senior Citizens 200 N 2nd St, St Charles 63301 | (636) 949-3560 |
| St Charles Street Div 370 North Dr, St Charles 63301 | (636) 949-3363 |
| St Charles Weeds-Nuisance 200 N 2nd St # 303, St Charles 63301 | (636) 949-3503 |
| Ranger-Interpretive Services 1900 W Randolph St, St Charles 63301 | (636) 949-3377 |
| Ranger-Interpretive Services 2700 W Clay St, St Charles 63301 | (636) 949-3377 |
| Mo R Sewage Treatment Plant 2500 N Main St, St Charles 63301 | (636) 946-1091 |
| Mc Nair Park Main Concession 3200 Droste Rd, St Charles 63301 | (636) 723-0015 |
| Humane Office-Animal Control 2835 W Randolph St, St Charles 63301 | (636) 949-3395 |
| Finance Department-Purchasing 200 N 2nd St, St Charles 63301 | (636) 949-3254 |
| City-St Charles Public Wrk Dep 200 N 2nd St # 202, St Charles 63301 | (636) 949-3237 |
| Citizens 24 Hour Hotline 200 N 2nd St, St Charles 63301 | (636) 949-3502 |
| City Development-Bldg Dept 200 N 2nd St # 303, St Charles 63301 | (636) 949-3222 |