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> South Dakota > Zip Code 57440
| Zip Code : | 57440 |
| City : | Frankfort city |
| County : | Spink County |
| State : | South Dakota (SD) |
| Land Area : | 142.57 sq mi |
| Water Area : | 0.68 sq mi |
| Latitude : | 44.8569688 |
| Longitude : | -98.2719339 |
| Population (2010): | 612 |
| Population Estimate (2012) : | 468 |
| Population Density : | 4.29/sq mi |
| Housing Units (2012) : | 197 |
| Median Household Income (2012) : | $55,000 (South Dakota : $49,091, USA : $53,046) |
| Median Family Income (2012) : | $62,143 (South Dakota : $62,967, USA : $64,585) |
| Median House Price (2012) : | $36,600 (South Dakota : $129,800, USA : $181,400) |