Market insights · Illinois
Jefferson County, IL: growth, migration and housing
Jefferson County has 36,147 residents, down 2.3% since 2020 (+0.1% in the last year). In 2022–2023, 696 households moved in and 748 moved out (-52 net), while a net $5.0M of income left. Median household income is $63,118, the median home $126,000 and median rent $885 a month.
In Illinois: 62nd of 102 counties for 5-year population growth · 44th of 102 counties for net in-migration (per resident) · 67th of 102 counties for median household income · 63rd of 102 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Jefferson County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Marion County, IL | 83 | $2.8M |
| Franklin County, IL | 75 | $3.4M |
| Williamson County, IL | 31 | $1.6M |
| Wayne County, IL | 27 | $1.3M |
| Washington County, IL | 26 | $1.6M |
| Hamilton County, IL | 24 | $1.2M |
| St. Clair County, IL | 24 | $1.6M |
Where leavers went
Top counties by households leaving Jefferson County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Marion County, IL | 96 | $4.2M |
| Franklin County, IL | 56 | $2.0M |
| Williamson County, IL | 40 | $1.6M |
| Washington County, IL | 35 | $1.7M |
| Wayne County, IL | 33 | $1.5M |
| Hamilton County, IL | 25 | $0.9M |
| Madison County, IL | 21 | $0.7M |
BizyFi in Jefferson 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.