Washington County, Missouri
Washington County, Missouri, has 23,810 residents (July 2025 estimate). Its county seat is Potosi. It uses Central Time and covers 760 sq mi (1,968 km²) of land.
- Resident population, July 2025
- 23,810
- Land area
- 760 sq mi (1,968 km²)
- County seat or government
- Potosi
- Time zone
- Central TimeUTC-06:00 in January; UTC-05:00 in July
- Median household income
- $56,043 ± $6,053
- Median home value
- $129,400 ± $14,590
- Median rent, with utilities
- $684 ± $121
- Homes lived in by their owners
- 78.4% ± 3.5 points
- County type
- County
- Metro or micro area
- Outside any metro or micro areaNext to: Farmington, MO micro area and St. Louis, MO-IL metro area
- Water area
- 2.62 sq mi (6.79 km²)
- State
- Missouri
- County code (FIPS)
- 29221
- Coordinates (central point)
- 37.942611, -90.897018
These coordinates mark a central point for the area, not a street address. Income, home value, rent and homes lived in by their owners: U.S. Census Bureau, American Community Survey 2020–2024 5-year estimates, ± margin at 90% confidence; checked on October 13, 2026.
Time zones in Washington County
| Time zone | Local time and UTC offset | Next clock change |
|---|---|---|
| Central TimeAmerica/Chicago | UTC-06:00 in January; UTC-05:00 in July. Enable JavaScript for the live clock. | Enable JavaScript for upcoming changes. |
Near a time-zone line, check where you are with the time-zone finder. Your phone’s setting can differ.
ZIP Code areas, largest first
- 6302020,166 people
- 6362816,416 people
- 6308013,124 people
- 636649,693 people
- 654415,028 people
- 655654,845 people
- 636304,006 people
- 636243,447 people
- 636602,784 people
- 636481,858 people
- 630711,113 people
- 63622764 people
16 ZIP Code areas overlap Washington County. People counts are 2020–2024 estimates for each whole ZIP area. Mailing ZIPs can differ; check an address with USPS ZIP Code Lookup.
Official county information
We don’t have a website for this county yet. The US government’s local-office directory ↗ lists its offices. A geographic lookup cannot determine eligibility, tax liability or a court obligation.
Townships in Washington County, largest first
- Breton Township10,223 people
- Concord Township2,611 people
- Union Township2,530 people
- Liberty Township1,642 people
- Richwoods Township1,619 people
- Belgrade Township1,031 people
- Kingston Township882 people
- Johnson Township837 people
- Walton Township807 people
- Bellevue Township693 people
- Harmony Township595 people
People counts are American Community Survey 2020–2024 5-year estimates. All townships in Missouri, by county
School districts in Washington County, largest first
- Potosi R-III School District13,224 people
- Sullivan C-2 School District10,712 people
- Crawford County R-I School District5,852 people
- West St. Francois County R-IV School District5,302 people
- Kingston K-14 School District3,680 people
- Bismarck R-V School District3,083 people
- Valley R-VI School District2,492 people
- Richwoods R-VII School District1,607 people
Districts with land in the county; a district can cross county lines. People counts are American Community Survey 2020–2024 5-year estimates. A district boundary doesn’t decide which school a student attends.
Cities, towns and communities, largest first
These areas overlap the mapped boundary; an overlap does not mean that every address belongs to both.
- Potosi, Missouri (city)2,544 people
- Terre du Lac, Missouri (CDP)2,516 people
- Irondale, Missouri (city)622 people
- Mineral Point, Missouri (town)324 people
- Caledonia, Missouri (village)209 people
Bordering areas, nearest first
Distances are straight lines between map points.
- Crawford County, Missouri23 mi west
- Iron County, Missouri24 mi southeast
- St. Francois County, Missouri25 mi east
- Jefferson County, Missouri29 mi northeast
- Franklin County, Missouri34 mi north
Before using this answer on a form
Use a precise point for address-level questions. A device accuracy circle can cross a boundary; confirm tax, voting or jury details with the responsible office.
Find the county where you are now, check its ZIP area, or check the time zone where you are.