County ProfileIL
Monroe County
Population: 34,962 · 7 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
34,962
People
Median age
43.2
Housing
Total households
13,851
Income
Median household income
$102,880
Housing
Total housing units
14,759
Employment
Employment rate
66.9%
Education
Bachelor’s degree or higher
38.7%
Healthcare
Insured population
97.5%
County details
Local time 01:07:05(CT)| Name | Monroe |
|---|---|
| Total ZIP codes | 7total |
| ZIP codes (by type) | 4 Standard3 PO Box |
| Area code | 618, 730 |
| Timezone | Central Time (CT) |
| Coordinates | 38.2779831, -90.1790777 |
| Land area | 385.3 sq miles(997.9 km²) |
Map of Monroe county, Illinois with ZIP codes
Cities and Communities in Monroe County
Compare the largest cities in Monroe 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 Monroe County
Review the most populated postal areas across Monroe 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