| County | Rank | Change (2020) ↓ | 2025 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Montmorency County | 1 | 8.18% | 9,920 | 9,170 |
| Oscoda County | 2 | 7.5% | 8,853 | 8,235 |
| Keweenaw County | 3 | 7.09% | 2,206 | 2,060 |
| Lake County | 4 | 6.66% | 12,900 | 12,094 |
| Kalkaska County | 5 | 5.86% | 18,982 | 17,931 |
| Crawford County | 6 | 5.8% | 13,746 | 12,992 |
| Luce County | 7 | 5.38% | 6,757 | 6,412 |
| Antrim County | 8 | 5.28% | 24,697 | 23,458 |
| Montcalm County | 9 | 5.12% | 70,044 | 66,635 |
| Mecosta County | 10 | 4.88% | 41,733 | 39,790 |
| Alcona County | 11 | 4.72% | 10,673 | 10,192 |
| Leelanau County | 12 | 4.41% | 23,291 | 22,308 |
| Otsego County | 13 | 3.92% | 26,119 | 25,133 |
| Branch County | 14 | 3.91% | 46,641 | 44,884 |
| Ottawa County | 15 | 3.83% | 308,280 | 296,907 |
| Benzie County | 16 | 3.77% | 18,669 | 17,990 |
| Gladwin County | 17 | 3.7% | 26,317 | 25,378 |
| Manistee County | 18 | 3.55% | 25,956 | 25,066 |
| Newaygo County | 19 | 3.51% | 51,868 | 50,111 |
| Houghton County | 20 | 3.33% | 38,477 | 37,237 |
| Barry County | 21 | 3.23% | 64,620 | 62,598 |
| Roscommon County | 22 | 3.21% | 24,225 | 23,472 |
| Marquette County | 23 | 2.86% | 67,901 | 66,012 |
| Baraga County | 24 | 2.73% | 8,364 | 8,142 |
| Missaukee County | 25 | 2.68% | 15,469 | 15,065 |
| Cheboygan County | 26 | 2.46% | 26,216 | 25,587 |
| Osceola County | 27 | 2.28% | 23,432 | 22,909 |
| Muskegon County | 28 | 2.19% | 178,614 | 174,784 |
| Allegan County | 29 | 2.13% | 123,237 | 120,669 |
| Livingston County | 30 | 2.08% | 198,003 | 193,968 |
| Wexford County | 31 | 1.89% | 34,330 | 33,693 |
| Ogemaw County | 32 | 1.69% | 21,132 | 20,780 |
| Clare County | 33 | 1.59% | 31,334 | 30,843 |
| Iron County | 34 | 1.51% | 11,810 | 11,634 |
| Oceana County | 35 | 1.46% | 27,103 | 26,712 |
| Midland County | 36 | 1.34% | 84,593 | 83,478 |
| Grand Traverse County | 37 | 1.3% | 96,667 | 95,425 |
| Presque Isle County | 38 | 1.26% | 13,169 | 13,005 |
| Arenac County | 39 | 1.25% | 15,189 | 15,001 |
| Ontonagon County | 40 | 1.24% | 5,876 | 5,804 |
| Lapeer County | 41 | 1.22% | 89,667 | 88,583 |
| Kent County | 42 | 1.17% | 666,222 | 658,492 |
| Kalamazoo County | 43 | 1.17% | 264,861 | 261,796 |
| Clinton County | 44 | 0.87% | 79,856 | 79,170 |
| Ingham County | 45 | 0.8% | 286,957 | 284,675 |
| Cass County | 46 | 0.8% | 51,972 | 51,559 |
| Van Buren County | 47 | 0.64% | 76,056 | 75,574 |
| Dickinson County | 48 | 0.6% | 26,060 | 25,904 |
| Alpena County | 49 | 0.55% | 29,046 | 28,886 |
| Schoolcraft County | 50 | 0.52% | 8,099 | 8,057 |
| Gratiot County | 51 | 0.51% | 41,896 | 41,683 |
| Charlevoix County | 52 | 0.35% | 26,131 | 26,041 |
| St. Joseph County | 53 | 0.22% | 61,078 | 60,941 |
| Shiawassee County | 54 | 0.19% | 68,141 | 68,010 |
| Iosco County | 55 | -0.04% | 25,173 | 25,184 |
| St. Clair County | 56 | -0.06% | 160,286 | 160,380 |
| Monroe County | 57 | -0.15% | 154,665 | 154,896 |
| Delta County | 58 | -0.17% | 36,808 | 36,870 |
| Oakland County | 59 | -0.26% | 1,269,228 | 1,272,493 |
| Macomb County | 60 | -0.39% | 876,833 | 880,238 |
| Eaton County | 61 | -0.39% | 108,752 | 109,175 |
| Emmet County | 62 | -0.51% | 33,939 | 34,113 |
| Mason County | 63 | -0.66% | 28,841 | 29,033 |
| Calhoun County | 64 | -0.71% | 133,250 | 134,200 |
| Sanilac County | 65 | -0.89% | 40,140 | 40,499 |
| Jackson County | 66 | -0.92% | 158,756 | 160,231 |
| Hillsdale County | 67 | -0.96% | 45,291 | 45,731 |
| Chippewa County | 68 | -1.11% | 36,378 | 36,787 |
| Tuscola County | 69 | -1.22% | 52,662 | 53,312 |
| Genesee County | 70 | -1.25% | 400,720 | 405,777 |
| Alger County | 71 | -1.32% | 8,725 | 8,842 |
| Isabella County | 72 | -1.39% | 63,622 | 64,518 |
| Bay County | 73 | -1.46% | 102,224 | 103,742 |
| Saginaw County | 74 | -1.73% | 186,600 | 189,882 |
| Mackinac County | 75 | -1.73% | 10,629 | 10,816 |
| Berrien County | 76 | -2% | 151,113 | 154,197 |
| Washtenaw County | 77 | -2.21% | 363,600 | 371,834 |
| Ionia County | 78 | -2.63% | 65,114 | 66,870 |
| Huron County | 79 | -2.78% | 30,491 | 31,364 |
| Gogebic County | 80 | -2.98% | 13,918 | 14,346 |
| Wayne County | 81 | -3.02% | 1,735,623 | 1,789,586 |
| Lenawee County | 82 | -3.35% | 96,000 | 99,325 |
| Menominee County | 83 | -4.55% | 22,385 | 23,451 |
Michigan's counties show varied growth patterns from 2020 to 2025. Montmorency County leads with 8.18% annualized growth, followed by Oscoda County (7.5%) and Keweenaw County (7.09%). The largest counties are Wayne County (1,735,623), Oakland County (1,269,228), and Macomb County (876,833). Of the 83 counties in Michigan, 54 are growing while 29 have experienced population decline. Overall, counties averaged 1.32% annualized growth, with total population growing by -0.25% annually.