| Rank | County | Population |
| 1 | Wayne County | 1,753,059 |
| 2 | Oakland County | 1,255,340 |
| 3 | Macomb County | 870,893 |
| 4 | Kent County | 652,617 |
| 5 | Genesee County | 406,770 |
| 6 | Washtenaw County | 368,385 |
| 7 | Ingham County | 290,923 |
| 8 | Ottawa County | 289,162 |
| 9 | Kalamazoo County | 264,322 |
| 10 | Saginaw County | 191,166 |
| 11 | Livingston County | 190,832 |
| 12 | Muskegon County | 173,679 |
| 13 | St. Clair County | 159,285 |
| 14 | Jackson County | 158,174 |
| 15 | Berrien County | 153,797 |
| 16 | Monroe County | 150,000 |
| 17 | Calhoun County | 133,943 |
| 18 | Allegan County | 117,104 |
| 19 | Eaton County | 109,730 |
| 20 | Bay County | 103,506 |
| 21 | Lenawee County | 98,310 |
| 22 | Grand Traverse County | 92,640 |
| 23 | Lapeer County | 87,975 |
| 24 | Midland County | 83,445 |
| 25 | Clinton County | 78,957 |
| 26 | Van Buren County | 75,416 |
| 27 | Isabella County | 70,363 |
| 28 | Shiawassee County | 68,176 |
| 29 | Marquette County | 66,403 |
| 30 | Ionia County | 64,401 |
| 31 | Montcalm County | 63,516 |
| 32 | Barry County | 61,045 |
| 33 | St. Joseph County | 60,789 |
| 34 | Tuscola County | 52,683 |
| 35 | Cass County | 51,613 |
| 36 | Newaygo County | 48,687 |
| 37 | Hillsdale County | 45,707 |
| 38 | Mecosta County | 43,481 |
| 39 | Branch County | 43,428 |
| 40 | Sanilac County | 41,179 |
| 41 | Gratiot County | 40,692 |
| 42 | Chippewa County | 37,418 |
| 43 | Houghton County | 35,890 |
| 44 | Delta County | 35,874 |
| 45 | Wexford County | 33,433 |
| 46 | Emmet County | 33,175 |
| 47 | Huron County | 31,105 |
| 48 | Clare County | 30,655 |
| 49 | Mason County | 29,062 |
| 50 | Alpena County | 28,431 |
| 51 | Oceana County | 26,545 |
| 52 | Charlevoix County | 26,197 |
| 53 | Cheboygan County | 25,435 |
| 54 | Dickinson County | 25,373 |
| 55 | Gladwin County | 25,312 |
| 56 | Iosco County | 25,213 |
| 57 | Otsego County | 24,613 |
| 58 | Manistee County | 24,539 |
| 59 | Roscommon County | 23,863 |
| 60 | Osceola County | 23,323 |
| 61 | Antrim County | 23,301 |
| 62 | Menominee County | 22,902 |
| 63 | Leelanau County | 21,649 |
| 64 | Ogemaw County | 20,895 |
| 65 | Kalkaska County | 17,725 |
| 66 | Benzie County | 17,703 |
| 67 | Missaukee County | 15,075 |
| 68 | Arenac County | 15,013 |
| 69 | Gogebic County | 14,715 |
| 70 | Crawford County | 13,904 |
| 71 | Presque Isle County | 12,687 |
| 72 | Lake County | 11,805 |
| 73 | Iron County | 11,099 |
| 74 | Mackinac County | 10,781 |
| 75 | Alcona County | 10,396 |
| 76 | Montmorency County | 9,270 |
| 77 | Alger County | 9,098 |
| 78 | Baraga County | 8,337 |
| 79 | Oscoda County | 8,282 |
| 80 | Schoolcraft County | 8,031 |
| 81 | Luce County | 6,286 |
| 82 | Ontonagon County | 5,802 |
| 83 | Keweenaw County | 2,102 |