Market insights · Illinois
Marion County, IL: growth, migration and housing
Marion County has 36,382 residents, down 3.4% since 2020 (-0.3% in the last year). In 2022–2023, 733 households moved in and 760 moved out (-27 net), while a net $2.8M of income left. Median household income is $61,240, the median home $103,000 and median rent $794 a month.
In Illinois: 78th of 102 counties for 5-year population growth · 33rd of 102 counties for net in-migration (per resident) · 78th of 102 counties for median household income · 88th of 102 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Marion County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Clinton County, IL | 126 | $4.9M |
| Jefferson County, IL | 96 | $4.2M |
| Washington County, IL | 36 | $1.8M |
| Fayette County, IL | 33 | $1.5M |
| Clay County, IL | 23 | $0.9M |
| Effingham County, IL | 21 | $0.6M |
| Madison County, IL | 21 | $1.0M |
| St. Clair County, IL | 20 | $0.8M |
Where leavers went
Top counties by households leaving Marion County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Clinton County, IL | 134 | $5.7M |
| Jefferson County, IL | 83 | $2.8M |
| Washington County, IL | 51 | $2.3M |
| St. Clair County, IL | 34 | $2.0M |
| Clay County, IL | 26 | $0.7M |
| Fayette County, IL | 22 | $0.9M |
| Madison County, IL | 22 | $1.0M |
BizyFi in Marion 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.