Market insights · Illinois
Clinton County, IL: growth, migration and housing
Clinton County has 37,128 residents, up 0.6% since 2020 (+0.1% in the last year). In 2022–2023, 710 households moved in and 812 moved out (-102 net), while a net $8.5M of income left. Median household income is $86,588, the median home $192,400 and median rent $912 a month.
In Illinois: 12th of 102 counties for 5-year population growth · 72nd of 102 counties for net in-migration (per resident) · 12th of 102 counties for median household income · 17th of 102 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Clinton County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| St. Clair County, IL | 145 | $8.2M |
| Marion County, IL | 134 | $5.7M |
| Madison County, IL | 101 | $5.9M |
| Bond County, IL | 22 | $0.8M |
| Washington County, IL | 21 | $0.7M |
Where leavers went
Top counties by households leaving Clinton County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| St. Clair County, IL | 146 | $7.7M |
| Marion County, IL | 126 | $4.9M |
| Madison County, IL | 118 | $8.1M |
| Washington County, IL | 43 | $2.5M |
| St. Louis County, MO | 32 | $1.6M |
| Bond County, IL | 29 | $1.4M |
BizyFi in Clinton County
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Sources: U.S. Census Bureau population estimates (vintage 2025), American Community Survey 5-year (2024), and IRS Statistics of Income county-to-county migration data (2022–2023). Migration counts are tax returns (roughly households) moving between U.S. counties; the IRS suppresses very small flows. Growth rates, per-1,000 figures, rent share and state ranks are BizyFi calculations. Data updated 2026-10-17. This product uses the Census Bureau Data API but is not endorsed or certified by the Census Bureau.