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> South Dakota > Zip Code 57751
| Zip Code : | 57751 |
| City : | Keystone town |
| County : | Custer County, Pennington County |
| State : | South Dakota (SD) |
| Land Area : | 68.21 sq mi |
| Water Area : | 0.04 sq mi |
| Latitude : | 43.8845332 |
| Longitude : | -103.4531375 |
| Population (2010): | 844 |
| Population Estimate (2012) : | 893 |
| Population Density : | 12.37/sq mi |
| Housing Units (2012) : | 556 |
| Median Household Income (2012) : | $50,859 (South Dakota : $49,091, USA : $53,046) |
| Median Family Income (2012) : | $54,375 (South Dakota : $62,967, USA : $64,585) |
| Median House Price (2012) : | $195,200 (South Dakota : $129,800, USA : $181,400) |