Marion County, IL — Demographics & Population
Population, age distribution, race & ethnicity, and education data
Population Overview
Source: Census Bureau ACS (2023)Total Population
37,294
Male
18,330
49.1%
Female
18,964
50.9%
Median Age
41.3 yrs
Avg Household Size
2.4
Foreign Born
1.5%
Race & Ethnicity
Source: Census Bureau ACS (2023)Age Distribution
Source: Census Bureau ACS (2023)Education
Source: Census Bureau ACS (2023)Bachelor's or Higher12.0%
High School or Higher37.0%
Other Demographics
Source: Census Bureau ACS (2023)Veterans
6.5%
Disability
0.0%
Non-English Home
6.7%
Married
41.5%
Marion County, IL has a population of 37,294 according to 2023 Census Bureau estimates. The median age is 41.3 years. The largest racial or ethnic group is White at 90.4% of the population. 12.0% of residents hold a bachelor's degree or higher. 1.5% of residents are foreign-born.