| Zip Code : | 50401 |
| City : | Mason city, Plymouth city, Portland, Rock Falls city |
| County : | Cerro Gordo County |
| State : | Iowa (IA) |
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| Land Area : | 149.16 sq mi |
| Water Area : | 0.46 sq mi |
| Latitude : | 43.1531687 |
| Longitude : | -93.1998201 |
| | |
| Population (2010): | 29,837 |
| Population Estimate (2012) : | 29,617 |
| Population Density : | 200.03/sq mi |
| Housing Units (2012) : | 14,147 |
| Median Household Income (2012) : | $42,167 (Iowa : $51,129, USA : $53,046) |
| Median Family Income (2012) : | $60,185 (Iowa : $64,772, USA : $64,585) |
| Median House Price (2012) : | $98,400 (Iowa : $123,000, USA : $181,400) |