Market insights · Illinois
Randolph County, IL: growth, migration and housing
Randolph County has 29,921 residents, down 0.6% since 2020 (+0.2% in the last year). In 2022–2023, 450 households moved in and 552 moved out (-102 net), while a net $8.5M of income left. Median household income is $68,131, the median home $135,100 and median rent $780 a month.
In Illinois: 24th of 102 counties for 5-year population growth · 81st of 102 counties for net in-migration (per resident) · 45th of 102 counties for median household income · 50th of 102 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Randolph County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| St. Clair County, IL | 94 | $4.8M |
| Monroe County, IL | 52 | $2.7M |
| Perry County, IL | 50 | $1.8M |
| Jackson County, IL | 35 | $1.4M |
Where leavers went
Top counties by households leaving Randolph County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| St. Clair County, IL | 80 | $3.7M |
| Monroe County, IL | 60 | $4.4M |
| Perry County, IL | 56 | $2.1M |
| Jackson County, IL | 35 | $1.5M |
| Perry County, MO | 30 | $1.8M |
| St. Louis County, MO | 27 | $1.2M |
| Madison County, IL | 20 | $0.7M |
BizyFi in Randolph 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.