St. Clair County, IL Demographics

This page shows a collection of maps for St. Clair County (pop: 257,400) of different demographic data.

St. Clair County, IL Household Size Map

This map shows household size in St. Clair County by neighborhood or county. St. Clair County has an average of 2.62 individuals per household. Red areas have larger household sizes, which generally means more children. Green areas have smaller household sizes, and there will typically be fewer young children.

 

St. Clair County, IL Map of Household Size by Area
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Household Size Key

Smaller Households
Medium Size Households
Larger Households

St. Clair County, IL Resident Age Map

The median age of residents in St. Clair County is 40.46. This is older than the median age of 38.1 in the United States.

The areas in green are among the youngest areas in the county. Areas in red show St. Clair County neighborhoods where the median resident is older, and areas in yellow show areas where the median age is between the late 30s and early 40s.

 

St. Clair County, IL Map of Household Size by Area
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Resident Age Key

Young
Middle Age
Older

St. Clair County, IL Single Parent Homes Map

This map shows where single-parent households live. In St. Clair County, 12.61% of households have a single parent. Neighborhoods with very few one-parent households are green, and areas with many single-parent households are red.

 

St. Clair County, IL Map of Single Parent Households
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% Single Parent Homes Key

Few Single Parent Homes
Some Single Parent Homes
Many Single Parent Homes

Home Services

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Updated 2023 using the most recent data available (2021)