RANKING · 2025 ESTIMATES · 33 SHOWN OF 33

Fastest growing, New Mexico counties

New Mexico counties ranked by population growth from the 2020 census to 2025. 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

RELATEDLargest by population Fastest shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Valencia County, NMNM82,013+7.6%−84%

02Sandoval County, NMNM159,565+7.2%−83%

03Torrance County, NMNM16,100+7.0%−89%

04Catron County, NMNM3,827+6.9%−82%

05Doña Ana County, NMNM229,091+4.3%−85%

06Otero County, NMNM70,368+3.7%−81%

07Santa Fe County, NMNM156,907+1.3%−96%

08Lea County, NMNM74,749+0.4%−187%

09Eddy County, NMNM62,509+0.3%−95%

10Taos County, NMNM34,564+0.2%−99%

11Los Alamos County, NMNM19,407-0.1%−105%

12Luna County, NMNM25,407-0.1%−100%

13San Juan County, NMNM120,340-1.1%−104%

14Bernalillo County, NMNM667,601-1.3%−108%

15Rio Arriba County, NMNM39,832-1.3%−107%

16Cibola County, NMNM26,807-1.3%−118%

17Sierra County, NMNM11,395-1.6%−105%

18Colfax County, NMNM12,184-1.6%−117%

19Lincoln County, NMNM19,844-2.1%−104%

20Guadalupe County, NMNM4,343-2.4%−119%

21Chaves County, NMNM63,364-2.8%−145%

22Roosevelt County, NMNM18,615-3.0%−138%

23De Baca County, NMNM1,647-3.0%+464%

24Mora County, NMNM4,051-3.3%−115%

25Grant County, NMNM27,252-3.3%−128%

26Quay County, NMNM8,454-3.3%−46%

27San Miguel County, NMNM26,260-3.5%−120%

28Curry County, NMNM46,655-3.7%−155%

29Socorro County, NMNM15,838-4.6%−120%

30Union County, NMNM3,844-5.8%−575%

31Hidalgo County, NMNM3,929-6.0%+1266%

32Harding County, NMNM617-6.1%−66%

33McKinley County, NMNM68,119-6.6%−128%

SHOWING 1–33 OF 33

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