County ProfileIL
Washington County
Population: 13,761 · 10 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
13,761
People
Median age
44.2
Housing
Total households
5,795
Income
Median household income
$78,224
Housing
Total housing units
6,415
Employment
Employment rate
60.5%
Education
Bachelor’s degree or higher
23.5%
Healthcare
Insured population
96.6%
County details
Local time 05:35:42(CT)| Name | Washington |
|---|---|
| Total ZIP codes | 10total |
| ZIP codes (by type) | 8 Standard2 PO Box |
| Area code | 618, 730 |
| Timezone | Central Time (CT) |
| Coordinates | 38.3531405, -89.4171873 |
| Land area | 562.6 sq miles(1,457.1 km²) |
Map of Washington county, Illinois with ZIP codes
Cities and Communities in Washington County
Compare the largest cities in Washington County by population, median income, and growth. Use the table below to analyze key demographic shifts across the region.
— Data unavailable or suppressed by the U.S. Census Bureau for areas with small sample sizes to protect individual privacy.
ZIP Codes in Washington County
Review the most populated postal areas across Washington County. Use the ranking below to compare resident density and demographic scales between the county's major zones.
Data Sources & Citations
The geographic and demographic information presented on this site is compiled from publicly available, authoritative sources, including:
- United States Census BureauDemographic, population, housing, and socioeconomic data sourced from Census Bureau datasets, including the Decennial Census and the American Community Survey (ACS).Census Data
- United States Postal Service (USPS)ZIP code classifications, delivery types, and postal designations used for reference purposes. USPS ZIP codes are intended for mail delivery and may not always align exactly with Census geographic boundaries.USPS