RANKING · 2020 CENSUS · 33 SHOWN OF 33

Fastest growing, New Mexico counties · 2020

New Mexico counties ranked by population growth 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 shrinking Most population gained Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Eddy County, NMNM62,509+15.8%+151%

02Lea County, NMNM74,749+15.0%−3400%

03Sandoval County, NMNM159,565+13.1%−69%

04Los Alamos County, NMNM19,407+8.2%+550%

05Santa Fe County, NMNM156,907+7.4%−76%

06Otero County, NMNM70,368+6.3%−68%

07Doña Ana County, NMNM229,091+4.9%−83%

08Taos County, NMNM34,564+4.7%−84%

09Bernalillo County, NMNM667,601+2.1%−87%

10McKinley County, NMNM68,119+2.0%−92%

11Luna County, NMNM25,407+1.3%−97%

12Rio Arriba County, NMNM39,832+0.3%−99%

13Curry County, NMNM46,655+0.1%−98%

14Cibola County, NMNM26,807-0.2%−102%

15Valencia County, NMNM82,013-0.5%−101%

16Chaves County, NMNM63,364-0.7%−112%

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

18Quay County, NMNM8,454-3.3%−47%

19Roosevelt County, NMNM18,615-3.3%−142%

20Sierra County, NMNM11,395-3.4%−110%

21Catron County, NMNM3,827-3.9%−110%

22Grant County, NMNM27,252-4.5%−137%

23Guadalupe County, NMNM4,343-5.0%−140%

24Harding County, NMNM617-5.5%−70%

25San Juan County, NMNM120,340-6.4%−127%

26Socorro County, NMNM15,838-7.1%−132%

27San Miguel County, NMNM26,260-7.5%−144%

28Torrance County, NMNM16,100-8.2%−113%

29Colfax County, NMNM12,184-9.9%−201%

30Union County, NMNM3,844-10.3%−952%

31Mora County, NMNM4,051-14.2%−166%

32Hidalgo County, NMNM3,929-14.6%+3253%

33De Baca County, NMNM1,647-16.0%+2907%

SHOWING 1–33 OF 33

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