COUNTY · MI
St. Clair County, Michigan
St. Clair County is a county in Michigan with FIPS code 26147 and an estimated population of 159,874 (Census 2023), 13th largest of 83 in the state.
County facts
- Name
- St. Clair County
- State
- Michigan
- Type
- county
- FIPS code
- 26147
- State FIPS
- 26
- Population (2023)
- 159,874
- Change since 2020
- -0.3%
- State rank
- 13 of 83
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for St. Clair County?
St. Clair County, Michigan has the five-digit FIPS code 26147: 26 for the state and 147 for the county.
What state is St. Clair County in?
St. Clair County is in Michigan.
How do I know if an address is in this county?
Use the address lookup. ZIP codes and city names can cross county lines, so an address is the reliable check.
Sources: U.S. Census Bureau geographic reference files; Census Bureau Population Estimates, Vintage 2023. Last reviewed 2026-10-27.