RANKING · 2025 ESTIMATES · 33 SHOWN OF 33

Fastest shrinking, New Mexico counties

New Mexico counties with the steepest population decline 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 growing Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01McKinley County, NMNM68,119-6.6%−128%

02Harding County, NMNM617-6.1%−66%

03Hidalgo County, NMNM3,929-6.0%+1266%

04Union County, NMNM3,844-5.8%−575%

05Socorro County, NMNM15,838-4.6%−120%

06Curry County, NMNM46,655-3.7%−155%

07San Miguel County, NMNM26,260-3.5%−120%

08Quay County, NMNM8,454-3.3%−46%

09Grant County, NMNM27,252-3.3%−128%

10Mora County, NMNM4,051-3.3%−115%

11De Baca County, NMNM1,647-3.0%+464%

12Roosevelt County, NMNM18,615-3.0%−138%

13Chaves County, NMNM63,364-2.8%−145%

14Guadalupe County, NMNM4,343-2.4%−119%

15Lincoln County, NMNM19,844-2.1%−104%

16Colfax County, NMNM12,184-1.6%−117%

17Sierra County, NMNM11,395-1.6%−105%

18Cibola County, NMNM26,807-1.3%−118%

19Rio Arriba County, NMNM39,832-1.3%−107%

20Bernalillo County, NMNM667,601-1.3%−108%

21San Juan County, NMNM120,340-1.1%−104%

22Luna County, NMNM25,407-0.1%−100%

23Los Alamos County, NMNM19,407-0.1%−105%

24Taos County, NMNM34,564+0.2%−99%

25Eddy County, NMNM62,509+0.3%−95%

26Lea County, NMNM74,749+0.4%−187%

27Santa Fe County, NMNM156,907+1.3%−96%

28Otero County, NMNM70,368+3.7%−81%

29Doña Ana County, NMNM229,091+4.3%−85%

30Catron County, NMNM3,827+6.9%−82%

31Torrance County, NMNM16,100+7.0%−89%

32Sandoval County, NMNM159,565+7.2%−83%

33Valencia County, NMNM82,013+7.6%−84%

SHOWING 1–33 OF 33

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