| City : | Keystone Town |
| County : | Barnwell County, Lincoln County, Lonoke County, Pennington County |
| State : | South Dakota (SD) |
| | |
| Land Area : | 2.86 sq mi |
| Water Area : | 0.00 sq mi |
| Latitude : | 43.8955410 |
| Longitude : | -103.4266631 |
| | |
| Population (2010): | 337 |
| Population Estimate (2012) : | 397 |
| Population Density : | 117.84/sq mi |
| Housing Units (2012) : | 230 |
| Median Household Income (2012) : | $34,250 (South Dakota : $49,091, USA : $53,046) |
| Median Family Income (2012) : | $38,553 (South Dakota : $62,967, USA : $64,585) |
| Median House Price (2012) : | $128,600 (South Dakota : $129,800, USA : $181,400) |