Market insights · Illinois
Warren County, IL: growth, migration and housing
Warren County has 16,222 residents, down 3.6% since 2020 (+0.7% in the last year). In 2022–2023, 318 households moved in and 414 moved out (-96 net), while a net $5.3M of income left. Median household income is $67,385, the median home $105,000 and median rent $788 a month.
In Illinois: 82nd of 102 counties for 5-year population growth · 95th of 102 counties for net in-migration (per resident) · 49th of 102 counties for median household income · 82nd of 102 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Warren County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Knox County, IL | 62 | $2.3M |
| Mercer County, IL | 26 | $1.1M |
| Henderson County, IL | 24 | $1.3M |
Where leavers went
Top counties by households leaving Warren County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Knox County, IL | 88 | $3.5M |
| McDonough County, IL | 29 | $1.1M |
| Rock Island County, IL | 21 | $0.8M |
BizyFi in Warren 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.