Michigan Counties, Demographics & Geography
Complete official guide to all 83 counties in Michigan (MI). Explore 2024 US Census population estimates, county seats, FIPS codes, land areas, and interactive mapping tools powered by GeoMap Suite.
Michigan County Breakdown
Showing 8 of 8 documented counties and seats.
County Name | FIPS | County Seat | Population (Census) | Land Area | Quick Tool |
|---|---|---|---|---|---|
| Wayne County (Detroit) | 26163 | Detroit | 1,793,561 | 612 sq mi | Lookup |
| Oakland County | 26125 | Pontiac | 1,274,395 | 868 sq mi | Lookup |
| Macomb County | 26099 | Mount Clemens | 881,217 | 479 sq mi | Lookup |
| Kent County (Grand Rapids) | 26081 | Grand Rapids | 657,974 | 847 sq mi | Lookup |
| Genesee County (Flint) | 26049 | Flint | 406,211 | 636 sq mi | Lookup |
| Washtenaw County (Ann Arbor) | 26161 | Ann Arbor | 372,258 | 706 sq mi | Lookup |
| Ingham County (Lansing) | 26065 | Mason | 284,900 | 556 sq mi | Lookup |
| Kalamazoo County | 26077 | Kalamazoo | 261,670 | 562 sq mi | Lookup |
Geographic Structure of Michigan Counties
County Administration & Governance
In Michigan, county governments manage vital public infrastructure, tax assessments, law enforcement, judicial courts, election administration, and public records. The county seat (Detroit and other municipal headquarters) houses the primary courthouse, commissioners, and sheriff’s department.
All Michigan counties carry a unique 5-digit Federal Information Processing Standard (FIPS) code, where the first two digits (26) designate the state and the remaining three digits identify each specific jurisdiction.
Geographic & Demographic Highlights
- Most Populous County:Wayne County (Detroit) (1,793,561 residents)
- Largest by Land Area:Oakland County (868 sq mi)
- State Capital:Lansing
- Census Bureau Region:Midwest United States
Demographic calculations derive from the United States Census Bureau 2024 Population Estimates Program (PEP) and TIGER/Line geographic boundary files.