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Washington County, IL
13 cities and towns and 11 ZIP codes in Washington County, Illinois.
Population
13,627
Land area
563sq mi
People per sq mi
24
ZIP codes
11
Cities and towns in Washington County
Washington County at a glance
- Washington County is 89% less dense than Illinois as a whole.
- The median household income is $78,224, 6% below the Illinois median of $83,390.
- A typical owner-occupied home is valued at $155,700 (41% below Illinois) and median rent is $818 a month.
- Its largest cities are Nashville (2,940), Okawville (1,299) and Wamac (804).
Local data for Washington County, IL
Counts from official public data
Housing and community stats
Washington County, IL, American Community Survey 2020-2024
Median household income
$78,224
Poverty rate
7.5%
Median home value
$155,700
Prices +8.6% in a year
Median rent
$818/mo
Homeownership
84.1%
Bachelor's or higher
23.5%
Median age
44.2
Average commute
26.7 min
Largest reported origins and ancestries: German Americans (6,256), Irish Americans (1,771), Polish Americans (1,472).
Economy and federal money
Jobs, income, federal spending and pandemic loans
Unemployment rate
2.9%
Sep 2026, -0.3 pts in a year
Average annual pay
$61,812
6,218 jobs, 2025
Income per person
$63,450
BEA, 2024
Federal spending
$95M
FY 2026, $6,901 per person
PPP loans
$79.4M
1,715 loans, 9,233 jobs reported
Campaign donations
$129K
Itemized, 2026 cycle
How people get to work
Washington County, IL, workers 16 and older. American Community Survey 5-year estimates
- Drove alone83.7%
- Carpooled5.5%
- Public transit0.2%
- Walked2.0%
- Bicycle0.2%
- Taxi, ride-hailing, motorcycle or other1.1%
- Worked from home7.4%
Average one-way commute: 26.7 minutes for people who do not work from home.
Environment and hazard risk
Washington County, IL, from FEMA, NOAA and EPA
Natural hazard risk
Relatively Low
Top: earthquake
Storm events since 1996
376
Most often thunderstorm wind
Flood insurance policies
6
0.1% of homes, county
July high / Jan low
87° / 21°F
42.2 inches of rain a year
Hazards, floods and storm historyCheck a flood zone2 historic places
Health statistics
Share of adults in Washington County, IL, CDC PLACES estimates
Obesity
36.8%
U.S. 33.3% +3.5 pts
Diabetes
11.7%
U.S. 12.1% about the same
Smoking
13.8%
U.S. 12.8% +1.0 pts
Uninsured (18-64)
6.7%
U.S. 11.1% -4.4 pts
Cities, towns and ZIP codes in Washington County
Population shown
Frequently asked questions
- What is the largest city in Washington County, IL?
- Nashville is the largest city or town in Washington County, with about 2,940 residents.
- How many ZIP codes are in Washington County?
- Washington County includes 11 ZIP Code Tabulation Areas, including 62214, 62257, 62263, 62268, 62271.
- What is the population of Washington County, IL?
- About 13,627 people live in Washington County, based on American Community Survey 5-year estimates.
- What counties border Washington County?
- Washington County borders St. Clair County, Marion County, Clinton County, Jefferson County, Randolph County, Perry County.
Source: U.S. Census Bureau (TIGER/Line boundaries, American Community Survey) · Data as of 12/31/2023