Admitted to the Union on May 11, 1858 as the 32nd state.
- 1840 – 1940 federal censuses extant for all counties except for 1890.
| Aitkin | Anoka | Becker | Beltrami |
| Benton | Big Stone | Blue Earth | Brown |
| Carlton | Carver | Cass | Chippewa |
| Chisago | Clay | Clearwater | Cook |
| Cottonwood | Crow Wing | Dakota | Dodge |
| Douglas | Faribault | Fillmore | Freeborn |
| Goodhue | Grant | Hennepin | Houston |
| Hubbard | Isanti | Itasca | Jackson |
| Kanabec | Kandiyohi | Kittson | Koochiching |
| Lac Qui Parle | Lake | Lake Of The Wood | Le Sueur |
| Lincoln | Lyon | Mahnomen | Marshall |
| Martin | McLeod | Meeker | Mille Lacs |
| Morrison | Mower | Murray | Nicollet |
| Nobles | Norman | Olmsted | Otter Tail |
| Pennington | Pine | Pipestone | Polk |
| Pope | Ramsey | Red Lake | Redwood |
| Renville | Rice | Rock | Roseau |
| St. Louis | Scott | Sherburne | Sibley |
| Stearns | Steele | Stevens | Swift |
| Todd | Traverse | Wabasha | Wadena |
| Waseca | Washington | Watonwan | Wilkin |
| Winona | Wright | Yellow Medicine |