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| County : | Clay County |
| State : | South Dakota (SD) |
| Land Area : | 412.18 sq mi |
| Water Area : | 5.05 sq mi |
| Latitude : | 42.9129968 |
| Longitude : | -96.9797951 |
| Population (2010): | 13,864 |
| Population Estimate (2012) : | 13,966 |
| Population Density : | 33.64/sq mi |
| Housing Units (2012) : | 5,639 |
| Median Household Income (2012) : | $38,377 (South Dakota : $49,091, USA : $53,046) |
| Median Family Income (2012) : | $66,332 (South Dakota : $62,967, USA : $64,585) |
| Median House Price (2012) : | $131,900 (South Dakota : $129,800, USA : $181,400) |
Clay County Cities / Towns
| Irene City (420) | Vermillion City (10,571) | Wakonda Town (321) |
Clay County Zip Codes
| 57004 (3,356) | 57010 (493) | 57014 (1,471) |
| 57031 (741) | 57037 (819) | 57069 (11,988) |
| 57072 (584) | 57073 (711) |