New Mexico Counties by Population (2026)
2026 Pop.
50K
100K
150K
200K
250K
300K
350K
400K
450K
500K
550K
600K
650K
Top 5 Most Populous Counties
665,021
230,078
161,519
156,494
120,155
| County | 2026 Pop. ↓ | Area (mi²) | Density (/mi²) | Change (2020) |
|---|---|---|---|---|
| Bernalillo County | 665,021 | 1.2K | 573 | -1.75% |
| Doña Ana County | 230,078 | 3.8K | 60 | 4.55% |
| Sandoval County | 161,519 | 3.7K | 44 | 8.21% |
| Santa Fe County | 156,494 | 1.9K | 82 | 0.92% |
| San Juan County | 120,155 | 5.5K | 22 | -1.01% |
| Valencia County | 83,132 | 1.1K | 78 | 8.68% |
| Lea County | 75,052 | 4.4K | 17 | 0.56% |
| Otero County | 70,112 | 6.6K | 11 | 3.31% |
| McKinley County | 67,607 | 5.5K | 12 | -6.8% |
| Eddy County | 63,219 | 4.2K | 15 | 1.4% |
| Chaves County | 62,982 | 6.1K | 10 | -3.33% |
| Curry County | 45,933 | 1.4K | 33 | -5.04% |
| Rio Arriba County | 39,716 | 5.9K | 6.8 | -1.33% |
| Taos County | 34,687 | 2.2K | 16 | 0.66% |
| Grant County | 27,013 | 4K | 6.8 | -4.22% |
| Cibola County | 26,859 | 4.5K | 5.9 | -0.39% |
| San Miguel County | 26,086 | 4.7K | 5.5 | -3.86% |
| Luna County | 25,191 | 3K | 8.5 | -1.03% |
| Lincoln County | 19,652 | 4.8K | 4.1 | -3.23% |
| Los Alamos County | 19,387 | 109 | 178 | -0.14% |
| Roosevelt County | 18,445 | 2.4K | 7.5 | -3.7% |
| Torrance County | 16,258 | 3.3K | 4.9 | 7.96% |
| Socorro County | 15,746 | 6.6K | 2.4 | -4.86% |
| Colfax County | 12,057 | 3.8K | 3.2 | -2.4% |
| Sierra County | 11,377 | 4.2K | 2.7 | -1.6% |
| Quay County | 8,366 | 2.9K | 2.9 | -3.99% |
| Guadalupe County | 4,324 | 3K | 1.4 | -2.61% |
| Mora County | 4,010 | 1.9K | 2.1 | -4.32% |
| Hidalgo County | 3,907 | 3.4K | 1.1 | -6.15% |
| Catron County | 3,831 | 6.9K | 0.55 | 6.18% |
| Union County | 3,749 | 3.8K | 0.98 | -7.89% |
| De Baca County | 1,644 | 2.3K | 0.71 | -2.55% |
| Harding County | 613 | 2.1K | 0.29 | -5.98% |
Sources
- US Census State Population Estimates - Most recent state estimates from the Census Bureau's Population Estimates Program
- US Census County Population Estimates - Most recent county estimates from the Census Bureau's Population Estimates Program
- American Community Survey (2009 - 2013)
- Census QuickFacts
- Historical Populations of States and Counties (1790 - 1990)