Market insights · Missouri
St. Clair County, MO: growth, migration and housing
St. Clair County has 9,976 residents, up 6.7% since 2020 (+1.4% in the last year). In 2022–2023, 275 households moved in and 206 moved out (+69 net), bringing in a net $4.7M of income. Median household income is $53,043, the median home $157,100 and median rent $622 a month.
In Missouri: 12th of 115 counties for 5-year population growth · 4th of 115 counties for net in-migration (per resident) · 88th of 115 counties for median household income · 77th of 115 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to St. Clair County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Henry County, MO | 39 | $1.3M |
| Jackson County, MO | 21 | $0.9M |
| Greene County, MO | 20 | $0.7M |
Where leavers went
Top counties by households leaving St. Clair County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Henry County, MO | 33 | $1.0M |
BizyFi in St. Clair County
No companies in the BizyFi directory are based here yet. Search them on the company map (company names with a free account), or browse Missouri companies.
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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.