Post Offices List in Lyon County, Iowa:
| Alvord Post Office | 217 N Main St, Alvord, IA 51230 |
| Doon Post Office | 223 Main St, Doon, IA 51235 |
| George Post Office | 120 E Michigan Ave, George, IA 51237 |
| Inwood Post Office | 201 S Main St, Inwood, IA 51240 |
| Larchwood Post Office | 935 Broadway St, Larchwood, IA 51241 |
| Lester Post Office | 311 Main St, Lester, IA 51242 |
| Little Rock Post Office | 319 Main St, Little Rock, IA 51243 |
| Rock Rapids Post Office | 217 N 2nd Ave, Rock Rapids, IA 51246 |