County ProfileIL
Marion County
Population: 37,729 · 11 ZIP codes
Demographics
Source: U.S. Census Bureau (ACS/Decennial). Estimates vary by year.
People
Total population
37,729
People
Median age
41.5
Housing
Total households
15,512
Income
Median household income
$61,240
Housing
Total housing units
17,334
Employment
Employment rate
56.5%
Education
Bachelor’s degree or higher
16.8%
Healthcare
Insured population
93.6%
County details
Local time 02:46:49(CT)| Name | Marion |
|---|---|
| Total ZIP codes | 11total |
| ZIP codes (by type) | 11 Standard |
| Area code | 618, 730 |
| Timezone | Central Time (CT) |
| Coordinates | 38.6482361, -88.9203624 |
| Land area | 572.5 sq miles(1,482.9 km²) |
Map of Marion county, Illinois with ZIP codes
Cities and Communities in Marion County
Compare the largest cities in Marion 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 Marion County
Review the most populated postal areas across Marion 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