Market insights · Illinois
Knox County, IL: growth, migration and housing
Knox County has 47,767 residents, down 4.1% since 2020 (-0.4% in the last year). In 2022–2023, 839 households moved in and 936 moved out (-97 net), while a net $2.9M of income left. Median household income is $57,030, the median home $111,900 and median rent $788 a month.
In Illinois: 90th of 102 counties for 5-year population growth · 61st of 102 counties for net in-migration (per resident) · 89th of 102 counties for median household income · 76th of 102 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Knox County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Warren County, IL | 88 | $3.5M |
| Peoria County, IL | 77 | $5.7M |
| Henry County, IL | 42 | $2.0M |
| Tazewell County, IL | 33 | $2.6M |
| Cook County, IL | 32 | $1.2M |
| Rock Island County, IL | 32 | $1.8M |
| Fulton County, IL | 31 | $1.5M |
| Mercer County, IL | 29 | $1.2M |
Where leavers went
Top counties by households leaving Knox County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Peoria County, IL | 95 | $5.0M |
| Warren County, IL | 62 | $2.3M |
| Cook County, IL | 60 | $2.2M |
| Henry County, IL | 44 | $1.7M |
| Fulton County, IL | 36 | $1.2M |
| Rock Island County, IL | 34 | $1.6M |
| Tazewell County, IL | 33 | $1.3M |
| Scott County, IA | 28 | $1.1M |
BizyFi in Knox 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.