§ MO Missouri
County permits
Jefferson County
Jefferson County issues permits only for unincorporated areas. Inside an incorporated city? Pick the city below — its building department handles your permit.
§ 01 Unincorporated
Unincorporated Jefferson County.
If your property isn't inside an incorporated city, the county permit office handles your application directly.
- Permit authority
- Jefferson County Code Enforcement Division
- Website
- CivicGov Citizen Portal ↗
- Online portal
- CivicGov Citizen Portal ↗
- Phone
- 636-797-5310
- Address
- 725 Maple Street, Hillsboro, MO 63050
§ 02 Jurisdictions
Cities in Jefferson County
Click any city for its full permit guide — authority, fees, application steps, inspections, and exempt work.
§ 03 County navigation
Information last verified for Jefferson County, Missouri. Permit rules and fees change frequently — verify current requirements with the issuing department before applying. Jaspector is an educational reference, not legal advice.