| County : | Washington County |
| State : | Illinois (IL) |
| Land Area : | 562.57 sq mi |
| Water Area : | 1.33 sq mi |
| Latitude : | 38.3531405 |
| Longitude : | -89.4171873 |
| Population (2010): | 14,716 |
| Population Estimate (2012) : | 14,692 |
| Population Density : | 26.16/sq mi |
| Housing Units (2012) : | 6,534 |
| Median Household Income (2012) : | $54,407 (Illinois : $56,853, USA : $53,046) |
| Median Family Income (2012) : | $66,085 (Illinois : $70,144, USA : $64,585) |
| Median House Price (2012) : | $104,800 (Illinois : $190,800, USA : $181,400) |
Washington County Cities / Towns
| Addieville Village (252) | Ashley City (536) | Centralia City (13,032) |
| Du Bois Village (205) | Hoyleton Village (531) | Irvington Village (659) |
| Nashville City (3,258) | New Minden Village (215) | Oakdale Village (221) |
| Okawville Village (1,434) | Radom Village (220) | Richview Village (253) |
| Venedy Village (138) | Wamac City (1,185) |
Washington County Zip Codes
| 62214 (1,229) | 62237 (2,659) | 62257 (3,214) |
| 62263 (5,387) | 62268 (738) | 62271 (2,077) |
| 62801 (22,415) | 62803 (1,014) | 62808 (1,457) |
| 62831 (573) | 62848 (636) | 62876 (247) |
| 62877 (514) |