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%−29.8 pts

02Harding County, NMNM617-6.1%+11.8 pts

03Hidalgo County, NMNM3,929-6.0%−5.5 pts

04Union County, NMNM3,844-5.8%−7.0 pts

05Socorro County, NMNM15,838-4.6%−27.0 pts

06Curry County, NMNM46,655-3.7%−10.4 pts

07San Miguel County, NMNM26,260-3.5%−20.5 pts

08Quay County, NMNM8,454-3.3%+2.8 pts

09Grant County, NMNM27,252-3.3%−15.3 pts

10Mora County, NMNM4,051-3.3%−24.8 pts

11De Baca County, NMNM1,647-3.0%−2.5 pts

12Roosevelt County, NMNM18,615-3.0%−10.9 pts

13Chaves County, NMNM63,364-2.8%−8.9 pts

14Guadalupe County, NMNM4,343-2.4%−15.1 pts

15Lincoln County, NMNM19,844-2.1%−61.0 pts

16Colfax County, NMNM12,184-1.6%−11.4 pts

17Sierra County, NMNM11,395-1.6%−35.4 pts

18Cibola County, NMNM26,807-1.3%−8.9 pts

19Rio Arriba County, NMNM39,832-1.3%−21.2 pts

20Bernalillo County, NMNM667,601-1.3%−17.1 pts

21San Juan County, NMNM120,340-1.1%−25.3 pts

22Luna County, NMNM25,407-0.1%−38.2 pts

23Los Alamos County, NMNM19,407-0.1%−1.3 pts

24Taos County, NMNM34,564+0.2%−29.5 pts

25Eddy County, NMNM62,509+0.3%−6.0 pts

26Lea County, NMNM74,749+0.4%+0.9 pts

27Santa Fe County, NMNM156,907+1.3%−29.3 pts

28Otero County, NMNM70,368+3.7%−16.2 pts

29Doña Ana County, NMNM229,091+4.3%−24.6 pts

30Catron County, NMNM3,827+6.9%−31.3 pts

31Torrance County, NMNM16,100+7.0%−57.4 pts

32Sandoval County, NMNM159,565+7.2%−34.8 pts

33Valencia County, NMNM82,013+7.6%−38.6 pts

SHOWING 1–33 OF 33

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU POPULATION ESTIMATES