| County : | O'brien County |
| State : | Iowa (IA) |
| Land Area : | 573.03 sq mi |
| Water Area : | 0.17 sq mi |
| Latitude : | 43.0837455 |
| Longitude : | -95.6256244 |
| Population (2010): | 14,398 |
| Population Estimate (2012) : | 14,302 |
| Population Density : | 25.13/sq mi |
| Housing Units (2012) : | 6,649 |
| Median Household Income (2012) : | $45,194 (Iowa : $51,129, USA : $53,046) |
| Median Family Income (2012) : | $60,711 (Iowa : $64,772, USA : $64,585) |
| Median House Price (2012) : | $86,000 (Iowa : $123,000, USA : $181,400) |
O'brien County Cities / Towns
| Archer City (131) | Calumet City (170) | Hartley City (1,672) |
| Paullina City (1,056) | Primghar City (909) | Sanborn City (1,404) |
| Sheldon City (5,188) | Sutherland City (649) |
O'brien County Zip Codes
| 51009 (164) | 51022 (789) | 51046 (1,660) |
| 51047 (646) | 51058 (1,007) | 51201 (6,193) |
| 51231 (282) | 51238 (1,184) | 51245 (1,359) |
| 51248 (1,857) | 51346 (2,451) |