| Rank |
County |
Population (2012) |
| 1 |
Bernalillo County, New Mexico
|
673,460
|
| 2 |
Dona Ana County, New Mexico
|
214,445
|
| 3 |
Santa Fe County, New Mexico
|
146,375
|
| 4 |
Sandoval County, New Mexico
|
135,588
|
| 5 |
San Juan County, New Mexico
|
128,529
|
| 6 |
Valencia County, New Mexico
|
76,631
|
| 7 |
McKinley County, New Mexico
|
73,016
|
| 8 |
Lea County, New Mexico
|
66,338
|
| 9 |
Otero County, New Mexico
|
66,041
|
| 10 |
Chaves County, New Mexico
|
65,784
|
| 11 |
Eddy County, New Mexico
|
54,419
|
| 12 |
Curry County, New Mexico
|
49,938
|
| 13 |
Rio Arriba County, New Mexico
|
40,318
|
| 14 |
Taos County, New Mexico
|
32,779
|
| 15 |
Grant County, New Mexico
|
29,388
|
| 16 |
San Miguel County, New Mexico
|
28,891
|
| 17 |
Cibola County, New Mexico
|
27,334
|
| 18 |
Luna County, New Mexico
|
25,041
|
| 19 |
Roosevelt County, New Mexico
|
20,419
|
| 20 |
Lincoln County, New Mexico
|
20,309
|
| 21 |
Los Alamos County, New Mexico
|
18,159
|
| 22 |
Socorro County, New Mexico
|
17,603
|
| 23 |
Torrance County, New Mexico
|
16,021
|
| 24 |
Colfax County, New Mexico
|
13,223
|
| 25 |
Sierra County, New Mexico
|
11,895
|
| 26 |
Quay County, New Mexico
|
8,769
|
| 27 |
Hidalgo County, New Mexico
|
4,794
|
| 28 |
Mora County, New Mexico
|
4,705
|
| 29 |
Guadalupe County, New Mexico
|
4,603
|
| 30 |
Union County, New Mexico
|
4,431
|
| 31 |
Catron County, New Mexico
|
3,658
|
| 32 |
De Baca County, New Mexico
|
1,927
|
| 33 |
Harding County, New Mexico
|
707
|