Mason County
Mason County Details
Map Coord - Letter = OM
Map Coord - Number = 99
| City/Township | Realcomp Map Area |
| AMBER TOWNSHIP | 53091 |
| BRANCH TOWNSHIP | 53111 |
| CUSTER | 53102 |
| CUSTER TOWNSHIP | 53101 |
| EDEN TOWNSHIP | 53141 |
| FOUNTAIN | 53062 |
| FREESOIL | 53022 |
| FREESOIL TOWNSHIP | 53021 |
| GRANT TOWNSHIP | 53011 |
| HAMLIN TOWNSHIP | 53041 |
| LOGAN TOWNSHIP | 53151 |
| LUDINGTON | 53082 |
| MEADE TOWNSHIP | 53031 |
| PERE MARQUETTE TOWNSHIP | 53081 |
| RIVERTON TOWNSHIP | 53131 |
| SCOTTVILLE | 53092 |
| SHERIDAN TOWNSHIP | 53071 |
| SHERMAN TOWNSHIP | 53061 |
| SUMMIT TOWNSHIP | 53121 |
| VICTORY TOWNSHIP | 53051 |