Admitted to the Union on November 2, 1889 as the 39th state.
- 1860 federal census for Unorganized Dakota extant.
- 1870 – 1880 federal censuses for Dakota Territory extant.
- 1885 North Dakota Territorial census extant.
- 1900 – 1940 federal censuses extant for all counties except for 1890.
| Adams | Barnes | Benson | Billings |
| Bottineau | Bowman | Burke | Burleigh |
| Cass | Cavalier | Dickey | Divide |
| Dunn | Eddy | Emmons | Foster |
| Golden Valley | Grand Forks | Grant | Griggs |
| Hettinger | Kidder | LaMoure | Logan |
| McHenry | McIntosh | McKenzie | McLean |
| Mercer | Morton | Mountrail | Nelson |
| Oliver | Pembina | Pierce | Ramsey |
| Ransom | Renville | Richland | Rolette |
| Sargent | Sheridan | Sioux | Slope |
| Stark | Steele | Stutsman | Towner |
| Traill | Walsh | Ward | Wells |
| Williams |