The 15 Counties of Michigan's Upper Peninsula
Keweenaw County
| Population: | 2,046 (15th) |
| Pop. Density: | 3.78 people/sq. mile (15th) |
| Land Area: | 541 sq. miles (15th) |
| Water Area: | 5,425 sq. miles (1st) |
| County Seat: | Eagle River |
| Largest Town: | Eagle River |
Ontonagon County
| Population: | 5,816 (13th) |
| Pop. Density: | 4.43 people/sq. mile (14th) |
| Land Area: | 1,312 sq. miles (3rd) |
| Water Area: | 2,430 sq. miles (3rd) |
| County Seat: | Ontonagon |
| Largest Town: | Ontonagon |
Luce County
| Population: | 5,339 (14th) |
| Pop. Density: | 5.91 people/sq. mile (13th) |
| Land Area: | 903 sq. miles (13th) |
| Water Area: | 1,009 sq. miles (7th) |
| County Seat: | Newberry |
| Largest Town: | Newberry |
Schoolcraft County
| Population: | 8,047 (12th) |
| Pop. Density: | 6.83 people/sq. mile (12th) |
| Land Area: | 1,178 sq. miles (4th) |
| Water Area: | 706 sq. miles (9th) |
| County Seat: | Manistique |
| Largest Town: | Manistique |
Baraga County
| Population: | 8,158 (11th) |
| Pop. Density: | 9.02 people/sq. mile (11th) |
| Land Area: | 904 sq. miles (12th) |
| Water Area: | 165 sq. miles (13th) |
| County Seat: | L'Anse |
| Largest Town: | L'Anse |
Alger County
| Population: | 8,842 (10th) |
| Pop. Density: | 9.63 people/sq. mile (10th) |
| Land Area: | 918 sq. miles (11th) |
| Water Area: | 4,131 sq. miles (2nd) |
| County Seat: | Munising |
| Largest Town: | Munising |
Iron County
| Population: | 11,631 (8th) |
| Pop. Density: | 9.89 people/sq. mile (9th) |
| Land Area: | 1,176 sq. miles (5th) |
| Water Area: | 45 sq. miles (14th) |
| County Seat: | Crystal Falls |
| Largest Town: | Iron River |
Mackinac County
| Population: | 10,834 (9th) |
| Pop. Density: | 10.6 people/sq. mile (8th) |
| Land Area: | 1,022 sq. miles (9th) |
| Water Area: | 1,079 sq. miles (6th) |
| County Seat: | St. Ignace |
| Largest Town: | St. Ignace |
Gogebic County
| Population: | 14,380 (7th) |
| Pop. Density: | 13.06 people/sq. mile (7th) |
| Land Area: | 1,101 sq. miles (7th) |
| Water Area: | 375 sq. miles (11th) |
| County Seat: | Bessemer |
| Largest Town: | Ironwood |
Menominee County
| Population: | 23,502 (6th) |
| Pop. Density: | 22.51 people/sq. mile (6th) |
| Land Area: | 1,044 sq. miles (8th) |
| Water Area: | 294 sq. miles (12th) |
| County Seat: | Menominee |
| Largest Town: | Menominee |
Chippewa County
| Population: | 36,785 (4th) |
| Pop. Density: | 23.57 people/sq. mile (5th) |
| Land Area: | 1,561 sq. miles (2nd) |
| Water Area: | 1,137 sq. miles (5th) |
| County Seat: | Sault Ste. Marie |
| Largest Town: | Sault Ste. Marie |
Delta County
| Population: | 36,903 (3rd) |
| Pop. Density: | 31.54 people/sq. mile (4th) |
| Land Area: | 1,170 sq. miles (6th) |
| Water Area: | 822 sq. miles (8th) |
| County Seat: | Escanaba |
| Largest Town: | Escanaba |
Dickinson County
| Population: | 25,947 (5th) |
| Pop. Density: | 33.87 people/sq. mile (3rd) |
| Land Area: | 766 sq. miles (14th) |
| Water Area: | 11 sq. miles (15th) |
| County Seat: | Iron Mountain |
| Largest Town: | Iron Mountain |
Marquette County
| Population: | 66,017 (1st) |
| Pop. Density: | 36.25 people/sq. mile (2nd) |
| Land Area: | 1,821 sq. miles (1st) |
| Water Area: | 1,604 sq. miles (4th) |
| County Seat: | Marquette |
| Largest Town: | Marquette |
Houghton County
| Population: | 37,361 (2nd) |
| Pop. Density: | 36.92 people/sq. mile (1st) |
| Land Area: | 1,012 sq. miles (10th) |
| Water Area: | 490 sq. miles (10th) |
| County Seat: | Houghton |
| Largest Town: | Houghton |