Market insights · Illinois
Cass County, IL: growth, migration and housing
Cass County has 12,463 residents, down 4.0% since 2020 (-0.5% in the last year). In 2022–2023, 267 households moved in and 330 moved out (-63 net), while a net $2.6M of income left. Median household income is $68,125, the median home $97,100 and median rent $723 a month.
In Illinois: 86th of 102 counties for 5-year population growth · 93rd of 102 counties for net in-migration (per resident) · 46th of 102 counties for median household income · 95th of 102 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Cass County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Sangamon County, IL | 41 | $2.1M |
| Morgan County, IL | 35 | $1.7M |
Where leavers went
Top counties by households leaving Cass County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Sangamon County, IL | 50 | $2.3M |
| Morgan County, IL | 49 | $1.8M |
| Schuyler County, IL | 27 | $1.1M |
| Menard County, IL | 20 | $0.7M |
BizyFi in Cass 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.