Market insights · Missouri
St. Charles County, MO: growth, migration and housing
St. Charles County has 426,499 residents, up 4.9% since 2020 (+0.9% in the last year). In 2022–2023, 10,386 households moved in and 9,808 moved out (+578 net), bringing in a net $70.8M of income. Median household income is $104,692, the median home $320,800 and median rent $1,370 a month.
In Missouri: 18th of 115 counties for 5-year population growth · 46th of 115 counties for net in-migration (per resident) · 1st of 115 counties for median household income · 2nd of 115 counties for median home value.
Where new residents came from
Top counties by households (tax returns) moving to St. Charles County, 2022–2023 (IRS).
| From | Households (tax returns) | Their income (AGI) |
|---|---|---|
| St. Louis County, MO | 3,854 | $287.4M |
| St. Louis city, MO | 602 | $39.9M |
| Lincoln County, MO | 541 | $34.8M |
| Warren County, MO | 330 | $19.6M |
| Jefferson County, MO | 253 | $15.5M |
| Madison County, IL | 205 | $15.6M |
| Franklin County, MO | 136 | $8.4M |
| Boone County, MO | 127 | $6.4M |
Where leavers went
Top counties by households leaving St. Charles County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| St. Louis County, MO | 2,599 | $166.3M |
| Lincoln County, MO | 897 | $60.5M |
| St. Louis city, MO | 559 | $30.4M |
| Warren County, MO | 545 | $35.8M |
| Jefferson County, MO | 283 | $17.4M |
| Madison County, IL | 182 | $10.8M |
| Franklin County, MO | 156 | $13.1M |
| Boone County, MO | 139 | $7.7M |
BizyFi in St. Charles County
Fewer than 3 companies in the BizyFi directory are based here. 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.