The largest county in Michigan
There are two right answers. By land area it is Marquette County; by population it is Wayne County. Which one you want depends on what you meant by largest.
Sources: US Census Bureau, Population Estimates Program, Vintage 2025 Population Estimates, released 26 March 2026; US Census Bureau, Gazetteer Files, 2025 Gazetteer Files, released 10 September 2025. Retrieved 30 August 2026.
By land area
| Rank | Name | Land area | Population |
|---|---|---|---|
| 1 | Marquette County | 1,809 sq mi | 68,064 |
| 2 | Chippewa County | 1,559 sq mi | 36,081 |
| 3 | Ontonagon County | 1,311 sq mi | 5,823 |
| 4 | Schoolcraft County | 1,172 sq mi | 8,187 |
| 5 | Delta County | 1,171 sq mi | 36,582 |
| 6 | Iron County | 1,166 sq mi | 11,757 |
| 7 | Gogebic County | 1,102 sq mi | 14,285 |
| 8 | Menominee County | 1,044 sq mi | 22,941 |
| 9 | Mackinac County | 1,022 sq mi | 11,236 |
| 10 | Houghton County | 1,009 sq mi | 37,842 |
By population
| Rank | Name | Population | Density |
|---|---|---|---|
| 1 | Wayne County | 1,769,038 | 2,891 per sq mi |
| 2 | Oakland County | 1,288,337 | 1,485 per sq mi |
| 3 | Macomb County | 886,221 | 1,849 per sq mi |
| 4 | Kent County | 675,232 | 795 per sq mi |
| 5 | Genesee County | 401,093 | 630 per sq mi |
| 6 | Washtenaw County | 370,214 | 524 per sq mi |
| 7 | Ottawa County | 308,459 | 547 per sq mi |
| 8 | Ingham County | 289,709 | 521 per sq mi |
| 9 | Kalamazoo County | 263,795 | 469 per sq mi |
| 10 | Livingston County | 197,315 | 349 per sq mi |
And the smallest
More on Michigan
Rebuilt from source data 30 August 2026. How these figures are produced.