Largest Counties in New Mexico

Rank County Population County Seat Established Area (km2) Density
1 Bernalillo County 670,957 Albuquerque 1852 3,020 222.17
2 Doña Ana County 213,587 Las Cruces 1852 9,860 21.66
3 Santa Fe County 145,637 Santa Fe 1852 4,944 29.46
4 Sandoval County 134,248 Bernalillo 1903 9,609 13.97
5 San Juan County 128,189 Aztec 1887 14,281 8.98
6 Valencia County 77,059 Los Lunas 1852 2,766 27.86
7 McKinley County 73,653 Gallup 1899 14,113 5.22
8 Chaves County 65,879 Roswell 1889 15,724 4.19
9 Otero County 65,692 Alamogordo 1899 17,164 3.83
10 Lea County 65,412 Lovington 1917 11,378 5.75
11 Eddy County 54,141 Carlsbad 1887 10,831 5
12 Curry County 49,638 Clovis 1909 3,642 13.63
13 Rio Arriba County 40,435 Tierra Amarilla 1852 15,172 2.67
14 Taos County 32,906 Taos 1852 5,706 5.77
15 Grant County 29,369 Silver City 1868 10,272 2.86
16 San Miguel County 29,290 Las Vegas 1852 12,217 2.4
17 Cibola County 27,647 Grants 1981 11,759 2.35
18 Luna County 25,270 Deming 1901 7,679 3.29
19 Lincoln County 20,443 Carrizozo 1869 12,512 1.63
20 Roosevelt County 20,435 Portales 1903 6,343 3.22
21 Los Alamos County 18,211 Los Alamos 1949 282 64.58
22 Socorro County 17,862 Socorro 1852 17,216 1.04
23 Torrance County 16,334 Estancia 1903 8,664 1.89
24 Colfax County 13,629 Raton 1869 9,731 1.4
25 Sierra County 11,932 Truth or Consequences 1884 10,826 1.1
26 Quay County 9,015 Tucumcari 1903 7,394 1.22
27 Hidalgo County 4,850 Lordsburg 1920 8,925 0.54
28 Mora County 4,762 Mora 1859 5,001 0.95
29 Guadalupe County 4,608 Santa Rosa 1891 7,850 0.59
30 Union County 4,422 Clayton 1893 9,920 0.45
31 Catron County 3,722 Reserve 1921 17,943 0.21
32 De Baca County 1,934 Fort Sumner 1917 6,022 0.32
33 Harding County 729 Mosquero 1921 5,506 0.13

Largest Counties in New Mexico

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