Post Offices List in Watonwan County, Minnesota:
| Butterfield Post Office | 105 2nd St N, Butterfield, MN 56120 |
| La Salle Post Office | 104 S Broadway, La Salle, MN 56056 |
| Lewisville Post Office | 225 Lewis St W, Lewisville, MN 56060 |
| Madelia Post Office | 23 Center Ave N, Madelia, MN 56062 |
| Odin Post Office | 105 N 1st St, Odin, MN 56160 |
| Saint James Post Office | 6 Armstrong Blvd S, Saint James, MN 56081 |