Post Offices List in Mille Lacs County, Minnesota:
| Bock Post Office | 1661 Wall Ave, Bock, MN 56313 |
| Foreston Post Office | 192 Washington Ave, Foreston, MN 56330 |
| Isle Post Office | 250 2nd Ave S, Isle, MN 56342 |
| Milaca Post Office | 230 2nd Ave Sw, Milaca, MN 56353 |
| Onamia Post Office | 600 Main St, Onamia, MN 56359 |
| Princeton Post Office | 205 N Rum River Dr, Princeton, MN 55371 |
| Wahkon Post Office | 140 N Main St, Wahkon, MN 56386 |