| 49402 Branch | 231 | Mason County | Michigan (MI) |
| 49405 Custer | 231 | Mason County | Michigan (MI) |
| 49410 Fountain | 231 | Mason County | Michigan (MI) |
| 49411 Free Soil | 231 | Mason County | Michigan (MI) |
| 49431 Ludington | 231 | Mason County | Michigan (MI) |
| 49454 Scottville | 231 | Mason County | Michigan (MI) |
| 49458 Walhalla | 231 | Mason County | Michigan (MI) |