| County : | Washington County |
| State : | Missouri (MO) |
| Land Area : | 759.91 sq mi |
| Water Area : | 2.58 sq mi |
| Latitude : | 37.9423150 |
| Longitude : | -90.8970558 |
| Population (2010): | 25,195 |
| Population Estimate (2012) : | 25,120 |
| Population Density : | 33.16/sq mi |
| Housing Units (2012) : | 11,017 |
| Median Household Income (2012) : | $34,015 (Missouri : $47,333, USA : $53,046) |
| Median Family Income (2012) : | $41,195 (Missouri : $59,395, USA : $64,585) |
| Median House Price (2012) : | $75,400 (Missouri : $138,400, USA : $181,400) |
Washington County Cities / Towns
| Caledonia Village (130) | Irondale City (445) | Mineral Point Town (351) |
| Potosi City (2,660) |
Washington County Zip Codes
| 63020 (20,714) | 63030 (407) | 63071 (1,103) |
| 63080 (13,987) | 63622 (1,011) | 63624 (3,757) |
| 63626 (1,037) | 63628 (16,014) | 63630 (4,062) |
| 63631 (849) | 63648 (1,628) | 63660 (4,276) |
| 63664 (8,920) | 63674 (132) | 65441 (5,194) |
| 65565 (5,854) |