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Washington County, MO
4 cities and towns and 12 ZIP codes in Washington County, Missouri.
Population
23,470
Land area
760sq mi
People per sq mi
31
ZIP codes
12
Cities and towns in Washington County
Washington County at a glance
- Washington County is 66% less dense than Missouri as a whole.
- The median household income is $56,043, 21% below the Missouri median of $70,702.
- A typical owner-occupied home is valued at $129,400 (44% below Missouri) and median rent is $684 a month.
- Its largest cities are Potosi (2,544), Irondale (622) and Mineral Point (324).
Local data for Washington County, MO
Counts from official public data
Housing and community stats
Washington County, MO, American Community Survey 2020-2024
Median household income
$56,043
Poverty rate
17.4%
Median home value
$129,400
Prices +2.6% in a year
Median rent
$684/mo
Homeownership
78.4%
Bachelor's or higher
11.7%
Median age
40.7
Average commute
38.4 min
Largest reported origins and ancestries: German Americans (3,284), Irish Americans (2,601), French Americans (1,401).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
3.7%
Sep 2026, -0.3 pts in a year
Average annual pay
$41,281
4,998 jobs, 2025
Income per person
$42,203
BEA, 2024
Federal spending
$153M
FY 2026, $6,494 per person
PPP loans
$43.9M
1,178 loans, 6,433 jobs reported
Campaign donations
$38.2K
Itemized, 2026 cycle
How people get to work
Washington County, MO, workers 16 and older. American Community Survey 5-year estimates
- Drove alone81.6%
- Carpooled10.6%
- Public transit0.0%
- Walked0.8%
- Bicycle0.0%
- Taxi, ride-hailing, motorcycle or other1.1%
- Worked from home5.8%
Average one-way commute: 38.4 minutes for people who do not work from home.
Environment and hazard risk
Washington County, MO, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Low
Top: heat wave
Storm events since 1996
415
Most often hail
Flood insurance policies
10
0.1% of homes, county
July high / Jan low
86° / 21°F
45.5 inches of rain a year
Hazards, floods and storm historyCheck a flood zone3 historic places
Health statistics
Share of adults in Washington County, MO, CDC PLACES estimates
Obesity
41.9%
U.S. 33.3% +8.6 pts
Diabetes
14.8%
U.S. 12.1% +2.7 pts
Smoking
22.9%
U.S. 12.8% +10.1 pts
Uninsured (18-64)
11.0%
U.S. 11.1% about the same
Cities, towns and ZIP codes in Washington County
Population shown
Frequently asked questions
- What is the largest city in Washington County, MO?
- Potosi is the largest city or town in Washington County, with about 2,544 residents.
- How many ZIP codes are in Washington County?
- Washington County includes 12 ZIP Code Tabulation Areas, including 63030, 63071, 63080, 63622, 63624.
- What is the population of Washington County, MO?
- About 23,470 people live in Washington County, based on American Community Survey 5-year estimates.
- What counties border Washington County?
- Washington County borders Jefferson County, Franklin County, St. Francois County, Crawford County, Iron County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023