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. The median across all 33 is 26,260.

New MexicoAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

YEAR1990 2000 2010 2020 2025

RANKPLACESTATETOTAL POPULATIONVS 2000

01Bernalillo County, NMNM667,601+20%

02Doña Ana County, NMNM229,091+31%

03▲1Sandoval County, NMNM159,565+77%

04▼1Santa Fe County, NMNM156,907+21%

05San Juan County, NMNM120,340+6%

06Valencia County, NMNM82,013+24%

07Lea County, NMNM74,749+35%

08▲1Otero County, NMNM70,368+13%

09▼1McKinley 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%

16▲1Cibola County, NMNM26,807+5%

17▼1San 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%

22▲1Torrance County, NMNM16,100−5%

23▼1Socorro 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 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES