Post Offices List in Pettis County, Missouri:
| Green Ridge Post Office | 106 N Main St, Green Ridge, MO 65332 |
| Houstonia Post Office | 103 N Walnut St, Houstonia, MO 65333 |
| Hughesville Post Office | 102 Mockbee St, Hughesville, MO 65334 |
| La Monte Post Office | 111 S Main St, La Monte, MO 65337 |
| Sedalia Post Office | 405 E 5th St, Sedalia, MO 65301 |
| Smithton Post Office | 104 S Walnut Ave, Smithton, MO 65350 |