| Department | Phone |
| Airport | 406-535-3264 |
| Appraisal Assessment Office | 406-708-7015 |
| Attorney | 406-535-8127 |
| Clerk and Recorder | 406-535-5242 |
| Clerk of District Court | 406-535-5026 |
| Commissioners | 406-535-5119 |
| Community Service Program | 406-535-7530 |
| County Nurse's Office | 406-535-7433 |
| Disaster and Emergency Services | 406-535-8118 |
| Election Information | 406-535-5242 |
| Extension Service | 406-535-3919 |
| Fairgrounds | 406-535-8841 |
| Family Planning | 406-535-8811 |
| Fergus County Committees | 406-535-5119 |
| Human Resources | 406-535-1083 or 406-535-8127 |
| Judge's Chambers | 406-538-8028 |
| Vehicle Recycling Program | 406-535-7466 |
| Juvenille Probation Office | 406-535-9242 |
| Justice of the Peace | 406-535-5418 |
| Planning Office | 406-535-9046 |
| Central Montana Environmental Health District | 406-535-7466 |
| Central Montana Public Health District | 406-535-3983 |
| Road Department | 406-535-5006 |
| Sanitarian | 406-535-7466 |
| Sheriff & Jail | 406-535-3415 |
| Superintendent of Schools | 406-535-3136 |
| Treasurer | 406-535-9220 |
| Weed District | 406-535-3970 |