| Post Office Name | City/State | Address | Phone Number | Action |
|---|---|---|---|---|
| Clear Lake Post Office | Clear Lake, IA 50428 | 410 1st Ave N | 6413572013 | View Details Get Directions |
| Fertile Post Office | Fertile, IA 50434 | 112 W Main St | 6417972252 | View Details Get Directions |
| Hanlontown Post Office | Hanlontown, IA 50444 | 201 Main St | 6418962921 | View Details Get Directions |
| Klemme Post Office | Klemme, IA 50449 | 115 E Main St | 6415872239 | View Details Get Directions |
| Mason City Post Office | Mason City, IA 50401 | 211 N Delaware Ave Ste 100 | 6414235231 | View Details Get Directions |
| Meservey Post Office | Meservey, IA 50457 | 424 1st St | 6413586329 | View Details Get Directions |
| Nora Springs Post Office | Nora Springs, IA 50458 | 19 S Hawkeye Ave | 6417495316 | View Details Get Directions |
| Plymouth Post Office | Plymouth, IA 50464 | 502 Main St | 6416963304 | View Details Get Directions |
| Rockford Post Office | Rockford, IA 50468 | 104 W Main Ave | 6417563812 | View Details Get Directions |
| Rockwell Post Office | Rockwell, IA 50469 | 313 Main St E | 6418223302 | View Details Get Directions |
| Sheffield Post Office | Sheffield, IA 50475 | 121 N 2nd St | 6418924156 | View Details Get Directions |
| Swaledale Post Office | Swaledale, IA 50477 | 202 5th St S | 6419952332 | View Details Get Directions |
| Thornton Post Office | Thornton, IA 50479 | 313 Main St | 6419982215 | View Details Get Directions |
| Ventura Post Office | Ventura, IA 50482 | 101 N Weimer St | 6418293518 | View Details Get Directions |
| Mailbox in Post Office Lobby | Mason City, IA 50401 | 211 N Delaware Ave | -- | Get Directions |
| Public Collection Box | Mason City, IA 50401 | 10 1st St Nw | -- | Get Directions |
| Public Collection Box | Mason City, IA 50401 | 1010 4th St Sw | -- | Get Directions |
| Public Collection Box | Mason City, IA 50401 | 103 E State St | -- | Get Directions |
| Public Collection Box | Mason City, IA 50401 | 112 W State St | -- | Get Directions |
| Public Collection Box | Mason City, IA 50401 | 1303 N Federal Ave | -- | Get Directions |
| Public Collection Box | Mason City, IA 50401 | 1415 S Monroe Ave | -- | Get Directions |
| Public Collection Box | Mason City, IA 50401 | 1810 S Federal Ave | -- | Get Directions |
| Public Collection Box | Mason City, IA 50401 | 220 E State St | -- | Get Directions |
| Public Collection Box | Mason City, IA 50401 | 220 N Washington Ave | -- | Get Directions |
| Public Collection Box | Mason City, IA 50401 | 2800 4th St Sw | -- | Get Directions |
| Public Collection Box | Mason City, IA 50401 | 4151 4th St Sw | -- | Get Directions |
| Public Collection Box | Mason City, IA 50401 | 520 S Pierce Ave | -- | Get Directions |
| Public Collection Box | Mason City, IA 50401 | 525 9th St. Se | -- | Get Directions |
| Public Collection Box | Mason City, IA 50401 | 777 S Eisenhower Ave | -- | Get Directions |
