COUNTY · MI
Mason County, Michigan
Mason County is a county in Michigan with FIPS code 26105 and an estimated population of 29,159 (Census 2023), 49th largest of 83 in the state.
County facts
- Name
- Mason County
- State
- Michigan
- Type
- county
- FIPS code
- 26105
- State FIPS
- 26
- Population (2023)
- 29,159
- Change since 2020
- +0.4%
- State rank
- 49 of 83
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Mason County?
Mason County, Michigan has the five-digit FIPS code 26105: 26 for the state and 105 for the county.
What state is Mason County in?
Mason 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.