| Zip Code : | 50579 |
| City : | Rockwell city, Twin Lakes |
| County : | Calhoun County |
| State : | Iowa (IA) |
| | |
| Land Area : | 137.35 sq mi |
| Water Area : | 1.31 sq mi |
| Latitude : | 42.3943097 |
| Longitude : | -94.6387578 |
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| Population (2010): | 2,405 |
| Population Estimate (2012) : | 2,939 |
| Population Density : | 17.51/sq mi |
| Housing Units (2012) : | 1,331 |
| Median Household Income (2012) : | $50,375 (Iowa : $51,129, USA : $53,046) |
| Median Family Income (2012) : | $57,155 (Iowa : $64,772, USA : $64,585) |
| Median House Price (2012) : | $70,200 (Iowa : $123,000, USA : $181,400) |