RANKING · 2020 CENSUS · 33 SHOWN OF 33

Fastest shrinking, New Mexico counties · 2020

New Mexico counties with the steepest population decline from the 2010 census to 2020. 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

01De Baca County, NMNM1,647-16.0%+2907%

02Hidalgo County, NMNM3,929-14.6%+3253%

03Mora County, NMNM4,051-14.2%−166%

04Union County, NMNM3,844-10.3%−952%

05Colfax County, NMNM12,184-9.9%−201%

06Torrance County, NMNM16,100-8.2%−113%

07San Miguel County, NMNM26,260-7.5%−144%

08Socorro County, NMNM15,838-7.1%−132%

09San Juan County, NMNM120,340-6.4%−127%

10Harding County, NMNM617-5.5%−70%

11Guadalupe County, NMNM4,343-5.0%−140%

12Grant County, NMNM27,252-4.5%−137%

13Catron County, NMNM3,827-3.9%−110%

14Sierra County, NMNM11,395-3.4%−110%

15Roosevelt County, NMNM18,615-3.3%−142%

16Quay County, NMNM8,454-3.3%−47%

17Lincoln County, NMNM19,844-1.1%−102%

18Chaves County, NMNM63,364-0.7%−112%

19Valencia County, NMNM82,013-0.5%−101%

20Cibola County, NMNM26,807-0.2%−102%

21Curry County, NMNM46,655+0.1%−98%

22Rio Arriba County, NMNM39,832+0.3%−99%

23Luna County, NMNM25,407+1.3%−97%

24McKinley County, NMNM68,119+2.0%−92%

25Bernalillo County, NMNM667,601+2.1%−87%

26Taos County, NMNM34,564+4.7%−84%

27Doña Ana County, NMNM229,091+4.9%−83%

28Otero County, NMNM70,368+6.3%−68%

29Santa Fe County, NMNM156,907+7.4%−76%

30Los Alamos County, NMNM19,407+8.2%+550%

31Sandoval County, NMNM159,565+13.1%−69%

32Lea County, NMNM74,749+15.0%−3400%

33Eddy County, NMNM62,509+15.8%+151%

SHOWING 1–33 OF 33

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UPDATED 2026-07-15 · DATA: US CENSUS BUREAU DECENNIAL CENSUS