Founded on Jan 15, 1851, Cerro Gordo County is one of 99 counties in the state of Iowa. Historically, Cerro Gordo County was formed from Floyd County. The city of Mason City is the county seat. With FIPS code of 33, Cerro Gordo County has a population of 42,706 and area of 568 square miles (1,471 km2).
List of all cities in Cerro Gordo County, IA alphabetically
| City/Town | Postal Code | Area Code |
| Burchinal, IA | 50469 | 641 |
| Cartersville, IA | 50469 | 641 |
| Central Heights, IA | 50401 | 641 |
| Clear Lake, IA | 50428 | 641 |
| Dougherty, IA | 50433 | 641 |
| Emery, IA | 50401 | 641 |
| Freeman, IA | 50401 | 641 |
| Hanford, IA | 50401 | 641 |
| Mason City, IA | 50401 | 641 |
| Mason City, IA | 50402 | 641 |
| Meservey, IA | 50457 | 641 |
| Plymouth, IA | 50464 | 641 |
| Portland, IA | 50401 | 641 |
| Rock Falls, IA | 50467 | 641 |
| Rockwell, IA | 50469 | 641 |
| Swaledale, IA | 50477 | 641 |
| Thornton, IA | 50479 | 641 |
| Ventura, IA | 50482 | 641 |
| Winnebago Heights, IA | 50401 | 641 |