RANKING · 2025 ESTIMATES · 33 SHOWN OF 33

Most densely populated, New Mexico counties

New Mexico counties ranked by residents per square mile (2025). This list covers the 33 counties in New Mexico that qualify, ranked against each other statewide. The median across all 33 is 7.

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SAME RANKING BYCities States Metros

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION DENSITYVS 2000

01Bernalillo County, NMNM667,601575+20%

02Los Alamos County, NMNM19,407178+6%

03Santa Fe County, NMNM156,90782+21%

04Valencia County, NMNM82,01377+24%

05Doña Ana County, NMNM229,09160+31%

06Sandoval County, NMNM159,56543+77%

07Curry County, NMNM46,65533+4%

08San Juan County, NMNM120,34022+6%

09Lea County, NMNM74,74917+35%

10Taos County, NMNM34,56416+15%

11Eddy County, NMNM62,50915+21%

12McKinley County, NMNM68,11912−9%

13▲1Otero County, NMNM70,36811+13%

14▼1Chaves County, NMNM63,36410+3%

15Luna County, NMNM25,4079+2%

16Roosevelt County, NMNM18,6158+3%

17Grant County, NMNM27,2527−12%

18Rio Arriba County, NMNM39,8327−3%

19Cibola County, NMNM26,8076+5%

20San Miguel County, NMNM26,2606−13%

21Torrance County, NMNM16,1005−5%

22Lincoln County, NMNM19,8444+2%

23Colfax County, NMNM12,1843−14%

24Quay County, NMNM8,4543−17%

25Sierra County, NMNM11,3953−14%

26Socorro County, NMNM15,8382−12%

27Mora County, NMNM4,0512−22%

28Guadalupe County, NMNM4,3431−7%

29Hidalgo County, NMNM3,9291−34%

30Union County, NMNM3,8441−8%

31De Baca County, NMNM1,6471−26%

32Catron County, NMNM3,8271+8%

33Harding County, NMNM6170−24%

SHOWING 1–33 OF 33

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES