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North Dakota was admitted to the Union on November 2, 1889.
Class 1
Class 3
| Senator | Party | From
| To |
| Gilbert A. Pierce | Republican | 1889 | 1891 |
| Henry C. Hansbrough | Republican | 1891 | 1909 |
| Martin N. Johnson | Republican | 1909 | |
| Fountain L. Thompson | Democrat | 1909 | 1910 |
| William E. Purcell | Democrat | 1910 | 1911 |
| Asle J. Gronna | Republican | 1911 | 1921 |
| Edwin F. Ladd | Republican | 1921 | 1925 |
| Gerald P. Nye | Republican | 1925 | 1945 |
| John Moses | Democrat | 1945 | 1945 |
| Milton R. Young | Republican | 1945 | 1981 |
| Mark Andrews | Republican | 1981 | 1987 |
| Kent Conrad | Democrat | 1987 | 1992 |
| Byron Dorgan | Democrat | 1992 | |
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