| County | Rank | Change (2020) ↓ | 2025 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Billings County | 1 | 12.75% | 1,052 | 933 |
| Cass County | 2 | 10.16% | 203,660 | 184,876 |
| Morton County | 3 | 2.88% | 34,275 | 33,315 |
| Renville County | 4 | 2.77% | 2,337 | 2,274 |
| Burleigh County | 5 | 2.68% | 101,244 | 98,601 |
| Logan County | 6 | 2.44% | 1,931 | 1,885 |
| Oliver County | 7 | 2.35% | 1,913 | 1,869 |
| McKenzie County | 8 | 1.37% | 14,978 | 14,776 |
| Adams County | 9 | 1.28% | 2,223 | 2,195 |
| Golden Valley County | 10 | 0.93% | 1,737 | 1,721 |
| LaMoure County | 11 | 0.85% | 4,136 | 4,101 |
| Williams County | 12 | 0.55% | 41,407 | 41,182 |
| Grand Forks County | 13 | 0.19% | 73,282 | 73,141 |
| McLean County | 14 | 0.14% | 9,780 | 9,766 |
| Richland County | 15 | -0.05% | 16,526 | 16,534 |
| Nelson County | 16 | -0.63% | 2,975 | 2,994 |
| Dunn County | 17 | -0.71% | 4,069 | 4,098 |
| Stark County | 18 | -0.78% | 33,567 | 33,832 |
| Mercer County | 19 | -0.89% | 8,273 | 8,347 |
| Mountrail County | 20 | -1.24% | 9,667 | 9,788 |
| Stutsman County | 21 | -1.47% | 21,224 | 21,540 |
| Bottineau County | 22 | -1.71% | 6,279 | 6,388 |
| McIntosh County | 23 | -1.71% | 2,474 | 2,517 |
| Hettinger County | 24 | -1.78% | 2,423 | 2,467 |
| Barnes County | 25 | -1.8% | 10,656 | 10,851 |
| Ramsey County | 26 | -1.86% | 11,357 | 11,572 |
| Steele County | 27 | -1.9% | 1,760 | 1,794 |
| Griggs County | 28 | -1.96% | 2,246 | 2,291 |
| Traill County | 29 | -2.17% | 7,814 | 7,987 |
| Dickey County | 30 | -2.52% | 4,844 | 4,969 |
| Burke County | 31 | -2.55% | 2,138 | 2,194 |
| Sheridan County | 32 | -2.62% | 1,226 | 1,259 |
| Sargent County | 33 | -2.82% | 3,720 | 3,828 |
| Ransom County | 34 | -3.11% | 5,515 | 5,692 |
| Pierce County | 35 | -3.47% | 3,844 | 3,982 |
| Cavalier County | 36 | -3.56% | 3,572 | 3,704 |
| Ward County | 37 | -3.58% | 67,420 | 69,921 |
| Emmons County | 38 | -3.71% | 3,164 | 3,286 |
| Benson County | 39 | -4.11% | 5,691 | 5,935 |
| Wells County | 40 | -4.73% | 3,784 | 3,972 |
| Kidder County | 41 | -4.95% | 2,264 | 2,382 |
| Pembina County | 42 | -5.05% | 6,493 | 6,838 |
| Walsh County | 43 | -5.07% | 9,995 | 10,529 |
| Grant County | 44 | -5.12% | 2,169 | 2,286 |
| Bowman County | 45 | -5.94% | 2,803 | 2,980 |
| Rolette County | 46 | -6.09% | 11,450 | 12,193 |
| McHenry County | 47 | -6.17% | 5,003 | 5,332 |
| Divide County | 48 | -6.26% | 2,067 | 2,205 |
| Slope County | 49 | -6.4% | 658 | 703 |
| Eddy County | 50 | -6.41% | 2,175 | 2,324 |
| Foster County | 51 | -6.5% | 3,167 | 3,387 |
| Towner County | 52 | -8.24% | 1,970 | 2,147 |
| Sioux County | 53 | -8.32% | 3,557 | 3,880 |
North Dakota's counties show varied growth patterns from 2020 to 2025. Billings County leads with 12.75% annualized growth, followed by Cass County (10.16%) and Morton County (2.88%). The largest counties are Cass County (203,660), Burleigh County (101,244), and Grand Forks County (73,282). Of the 53 counties in North Dakota, 14 are growing while 39 have experienced population decline. Overall, counties averaged -1.82% annualized growth, with total population growing by 1.85% annually.