| County | Rank | Change (2020) ↓ | 2025 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Torrance County | 1 | 8.08% | 16,273 | 15,057 |
| Valencia County | 2 | 7.65% | 82,363 | 76,507 |
| Sandoval County | 3 | 6.88% | 159,571 | 149,301 |
| Doña Ana County | 4 | 5.51% | 232,198 | 220,069 |
| Catron County | 5 | 4.93% | 3,787 | 3,609 |
| Otero County | 6 | 3.24% | 70,068 | 67,866 |
| Lea County | 7 | 2.89% | 76,799 | 74,643 |
| Luna County | 8 | 2.85% | 26,183 | 25,457 |
| Los Alamos County | 9 | 2.62% | 19,930 | 19,422 |
| Santa Fe County | 10 | 2.56% | 159,023 | 155,056 |
| Taos County | 11 | 0.04% | 34,480 | 34,465 |
| Guadalupe County | 12 | -0.14% | 4,436 | 4,442 |
| Eddy County | 13 | -0.2% | 62,218 | 62,342 |
| Colfax County | 14 | -0.41% | 12,302 | 12,353 |
| San Juan County | 15 | -0.54% | 120,727 | 121,387 |
| Rio Arriba County | 16 | -0.69% | 39,989 | 40,268 |
| Bernalillo County | 17 | -0.88% | 670,922 | 676,882 |
| Cibola County | 18 | -1.25% | 26,631 | 26,969 |
| Lincoln County | 19 | -1.48% | 20,003 | 20,304 |
| Chaves County | 20 | -2.19% | 63,726 | 65,153 |
| Grant County | 21 | -2.28% | 27,570 | 28,214 |
| De Baca County | 22 | -2.44% | 1,642 | 1,683 |
| Sierra County | 23 | -2.78% | 11,243 | 11,565 |
| Curry County | 24 | -2.86% | 46,991 | 48,374 |
| Mora County | 25 | -2.98% | 4,067 | 4,192 |
| Roosevelt County | 26 | -3.16% | 18,547 | 19,153 |
| San Miguel County | 27 | -3.34% | 26,223 | 27,128 |
| Socorro County | 28 | -3.94% | 15,906 | 16,559 |
| Harding County | 29 | -4.13% | 627 | 654 |
| Union County | 30 | -4.74% | 3,880 | 4,073 |
| Hidalgo County | 31 | -5.04% | 3,953 | 4,163 |
| McKinley County | 32 | -5.19% | 68,817 | 72,586 |
| Quay County | 33 | -5.25% | 8,253 | 8,710 |
New Mexico's counties show varied growth patterns from 2020 to 2025. Torrance County leads with 8.08% annualized growth, followed by Valencia County (7.65%) and Sandoval County (6.88%). The largest counties are Bernalillo County (670,922), Doña Ana County (232,198), and Sandoval County (159,571). Of the 33 counties in New Mexico, 11 are growing while 22 have experienced population decline. Overall, counties averaged -0.26% annualized growth, with total population growing by 0.98% annually.
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