| Localité | Code postal |
|---|---|
| Burchinal, Cerro Gordo | 50469 |
| Cartersville, Cerro Gordo | 50469 |
| Central Heights, Cerro Gordo | 50401 |
| Clear Lake, Cerro Gordo | 50428 |
| Dougherty, Cerro Gordo | 50433 |
| Emery, Cerro Gordo | 50401 |
| Fertile, Cerro Gordo | 50434 |
| Freeman, Cerro Gordo | 50401 |
| Hanford, Cerro Gordo | 50401 |
| Hanlontown, Cerro Gordo | 50444 |
| Mason City, Cerro Gordo | 50401 |
| Meservey, Cerro Gordo | 50457 |
| Nora Springs, Cerro Gordo | 50458 |
| Plymouth, Cerro Gordo | 50464 |
| Portland, Cerro Gordo | 50401 |
| Rock Falls, Cerro Gordo | 50467 |
| Rockford, Cerro Gordo | 50468 |
| Rockwell, Cerro Gordo | 50469 |
| Swaledale, Cerro Gordo | 50477 |
| Thornton, Cerro Gordo | 50479 |
| Ventura, Cerro Gordo | 50482 |
| Winnebago Heights, Cerro Gordo | 50401 |