Market insights · Michigan
St. Clair County, MI: growth, migration and housing
St. Clair County has 160,486 residents, up 0.1% since 2020 (+0.1% in the last year). In 2022–2023, 3,218 households moved in and 3,195 moved out (+23 net), bringing in a net $7.9M of income. Median household income is $71,270, the median home $224,600 and median rent $1,029 a month.
In Michigan: 56th of 83 counties for 5-year population growth · 50th of 83 counties for net in-migration (per resident) · 22nd of 83 counties for median household income · 19th of 83 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) |
|---|---|---|
| Macomb County, MI | 1,331 | $83.4M |
| Oakland County, MI | 239 | $15.6M |
| Sanilac County, MI | 204 | $8.6M |
| Wayne County, MI | 152 | $7.9M |
| Lapeer County, MI | 120 | $6.4M |
| Genesee County, MI | 51 | $2.3M |
| Maricopa County, AZ | 30 | $2.1M |
| Kent County, MI | 29 | $2.9M |
Where leavers went
Top counties by households leaving St. Clair County, 2022–2023 (IRS).
| To | Households (tax returns) | Their income (AGI) |
|---|---|---|
| Macomb County, MI | 1,038 | $54.8M |
| Oakland County, MI | 269 | $18.7M |
| Sanilac County, MI | 217 | $9.8M |
| Wayne County, MI | 138 | $9.5M |
| Lapeer County, MI | 103 | $6.2M |
| Genesee County, MI | 64 | $2.9M |
| Kent County, MI | 57 | $2.4M |
| Washtenaw County, MI | 42 | $2.5M |
BizyFi in St. Clair 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.