RANKING · 2025 ESTIMATES · 33 SHOWN OF 33

Largest by population, New Mexico counties

The most populous New Mexico counties as of the 2025 population estimates. This list covers the 33 counties in New Mexico that qualify, ranked against each other statewide.

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SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS 2000

01Bernalillo County, NMNM667,601+20%

02Doña Ana County, NMNM229,091+31%

03Sandoval County, NMNM159,565+77%

04Santa Fe County, NMNM156,907+21%

05San Juan County, NMNM120,340+6%

06Valencia County, NMNM82,013+24%

07Lea County, NMNM74,749+35%

08Otero County, NMNM70,368+13%

09McKinley County, NMNM68,119−9%

10Chaves County, NMNM63,364+3%

11Eddy County, NMNM62,509+21%

12Curry County, NMNM46,655+4%

13Rio Arriba County, NMNM39,832−3%

14Taos County, NMNM34,564+15%

15Grant County, NMNM27,252−12%

16Cibola County, NMNM26,807+5%

17San Miguel County, NMNM26,260−13%

18Luna County, NMNM25,407+2%

19Lincoln County, NMNM19,844+2%

20Los Alamos County, NMNM19,407+6%

21Roosevelt County, NMNM18,615+3%

22Torrance County, NMNM16,100−5%

23Socorro County, NMNM15,838−12%

24Colfax County, NMNM12,184−14%

25Sierra County, NMNM11,395−14%

26Quay County, NMNM8,454−17%

27Guadalupe County, NMNM4,343−7%

28Mora County, NMNM4,051−22%

29Hidalgo County, NMNM3,929−34%

30Union County, NMNM3,844−8%

31Catron County, NMNM3,827+8%

32De Baca County, NMNM1,647−26%

33Harding County, NMNM617−24%

SHOWING 1–33 OF 33

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU POPULATION ESTIMATES