COUNTY · MI
Allegan County, Michigan
Allegan County is a county in Michigan with FIPS code 26005 and an estimated population of 121,939 (Census 2023), 18th largest of 83 in the state.
County facts
- Name
- Allegan County
- State
- Michigan
- Type
- county
- FIPS code
- 26005
- State FIPS
- 26
- Population (2023)
- 121,939
- Change since 2020
- +1.1%
- State rank
- 18 of 83
Population is the Census Bureau’s Vintage 2023 estimate.
Questions
What is the FIPS code for Allegan County?
Allegan County, Michigan has the five-digit FIPS code 26005: 26 for the state and 005 for the county.
What state is Allegan County in?
Allegan 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.