Population of Counties in New Mexico (2018)
| Name | 2018 Population | Growth Since 2010 |
| Bernalillo County | 676,773 | 1.92% |
| Doña Ana County | 215,579 | 2.60% |
| Santa Fe County | 148,750 | 2.92% |
| Sandoval County | 142,507 | 7.65% |
| San Juan County | 126,926 | -2.52% |
| Valencia County | 75,940 | -1.11% |
| McKinley County | 72,564 | 1.25% |
| Lea County | 68,759 | 6.45% |
| Otero County | 65,817 | 2.22% |
| Chaves County | 64,866 | -1.31% |
| Eddy County | 56,997 | 5.73% |
| Curry County | 49,812 | 1.73% |
| Rio Arriba County | 39,159 | -2.83% |
| Taos County | 32,795 | -0.31% |
| San Miguel County | 27,748 | -5.63% |
| Grant County | 27,687 | -5.77% |
| Cibola County | 26,853 | -1.70% |
| Luna County | 24,078 | -4.00% |
| Lincoln County | 19,395 | -5.16% |
| Roosevelt County | 18,847 | -5.87% |
| Los Alamos County | 18,738 | 4.13% |
| Socorro County | 16,798 | -5.57% |
| Torrance County | 15,506 | -5.43% |
| Colfax County | 12,174 | -11.35% |
| Sierra County | 11,116 | -7.67% |
| Quay County | 8,306 | -8.38% |
| Mora County | 4,551 | -6.99% |
| Guadalupe County | 4,429 | -5.65% |
| Hidalgo County | 4,305 | -11.49% |
| Union County | 4,187 | -7.82% |
| Catron County | 3,587 | -4.35% |
| De Baca County | 1,829 | -9.86% |
| Harding County | 692 | -0.29% |