Market insights · Illinois
Union County, IL: growth, migration and housing
Union County has 16,656 residents, down 3.7% since 2020 (-1.1% in the last year). In 2022–2023, 261 households moved in and 295 moved out (-34 net), while a net $2.1M of income left. Median household income is $55,728, the median home $131,700 and median rent $648 a month.
In Illinois: 84th of 102 counties for 5-year population growth · 62nd of 102 counties for net in-migration (per resident) · 93rd of 102 counties for median household income · 55th of 102 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Union County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Jackson County, IL | 43 | $2.0M |
| Williamson County, IL | 29 | $2.1M |
| Pulaski County, IL | 24 | $0.7M |
| Johnson County, IL | 23 | $1.1M |
Where leavers went
Top counties by households leaving Union County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Jackson County, IL | 44 | $1.6M |
| Williamson County, IL | 40 | $3.1M |
| Cape Girardeau County, MO | 22 | $0.9M |
| Johnson County, IL | 21 | $1.6M |
BizyFi in Union 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.