| Year | Cass | Burleigh | Grand Forks | Ward | Williams | Morton | Stark | Stutsman | Richland | McKenzie |
| 1880 | 8998 | 3246 | 6248 | | 14 | 200 | | 1007 | 3597 | |
| 1890 | 19613 | 4247 | 18357 | 1681 | 109 | 4728 | 2304 | 5266 | 10751 | |
| 1900 | 28625 | 6081 | 24459 | 7961 | 1530 | 8069 | 7621 | 9143 | 17387 | |
| 1910 | 33935 | 13087 | 27888 | 25221 | 14234 | 25289 | 12504 | 18189 | 19659 | 5720 |
| 1920 | 41477 | 15578 | 28795 | 28811 | 17980 | 18714 | 13542 | 24575 | 20887 | 9544 |
| 1930 | 48735 | 19769 | 31956 | 33597 | 19553 | 19647 | 15340 | 26100 | 21008 | 9709 |
| 1940 | 52849 | 22736 | 34518 | 31981 | 16315 | 20184 | 15414 | 23495 | 20519 | 8426 |
| 1950 | 58877 | 25673 | 39448 | 34782 | 16442 | 19295 | 16137 | 24158 | 19865 | 6849 |
| 1960 | 66947 | 34016 | 48677 | 47072 | 22051 | 20992 | 18451 | 25137 | 18824 | 7296 |
| 1970 | 73653 | 40714 | 61102 | 58560 | 19301 | 20310 | 19613 | 23550 | 18089 | 6127 |
| 1980 | 88247 | 54811 | 66100 | 58392 | 22237 | 25177 | 23697 | 24154 | 19207 | 7132 |
| 1990 | 102874 | 60131 | 70683 | 57921 | 21129 | 23700 | 22832 | 22241 | 18148 | 6383 |
| 2000 | 123138 | 69416 | 66109 | 58975 | 19761 | 25303 | 22636 | 21908 | 17998 | 5737 |
| 2010 | 149778 | 81308 | 66861 | 61675 | 22398 | 27471 | 24199 | 21100 | 16321 | 6360 |
| 2020 | 184525 | 98458 | 73170 | 69919 | 40950 | 33291 | 33646 | 21593 | 16529 | 14704 |
