Market insights · Illinois
Washington County, IL: growth, migration and housing
Washington County has 13,564 residents, down 1.2% since 2020 (-0.1% in the last year). In 2022–2023, 339 households moved in and 313 moved out (+26 net), bringing in a net $1.4M of income. Median household income is $78,224, the median home $155,700 and median rent $818 a month.
In Illinois: 34th of 102 counties for 5-year population growth · 3rd of 102 counties for net in-migration (per resident) · 20th of 102 counties for median household income · 35th of 102 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to Washington County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Marion County, IL | 51 | $2.3M |
| St. Clair County, IL | 44 | $3.1M |
| Clinton County, IL | 43 | $2.5M |
| Jefferson County, IL | 35 | $1.7M |
| Perry County, IL | 26 | $1.6M |
Where leavers went
Top counties by households leaving Washington County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| St. Clair County, IL | 56 | $3.2M |
| Marion County, IL | 36 | $1.8M |
| Jefferson County, IL | 26 | $1.6M |
| Clinton County, IL | 21 | $0.7M |
| Madison County, IL | 20 | $1.1M |
BizyFi in Washington 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.