Post Offices List in Kalkaska County, Michigan:
| Fife Lake Post Office | 113 Oak St, Fife Lake, MI 49633 |
| Kalkaska Post Office | 105 W 3rd St, Kalkaska, MI 49646 |
| Rapid City Post Office | 8310 Rapid City Rd Nw, Rapid City, MI 49676 |
| South Boardman Post Office | 5408 Boardman Rd Sw, South Boardman, MI 49680 |