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%+9.5 pts

02Lea County, NMNM74,749+15.0%+15.5 pts

03Sandoval County, NMNM159,565+13.1%−28.9 pts

04Los Alamos County, NMNM19,407+8.2%+6.9 pts

05Santa Fe County, NMNM156,907+7.4%−23.3 pts

06Otero County, NMNM70,368+6.3%−13.6 pts

07Doña Ana County, NMNM229,091+4.9%−24.0 pts

08Taos County, NMNM34,564+4.7%−25.0 pts

09Bernalillo County, NMNM667,601+2.1%−13.7 pts

10McKinley County, NMNM68,119+2.0%−21.3 pts

11Luna County, NMNM25,407+1.3%−36.8 pts

12Rio Arriba County, NMNM39,832+0.3%−19.6 pts

13Curry County, NMNM46,655+0.1%−6.6 pts

14Cibola County, NMNM26,807-0.2%−7.7 pts

15Valencia County, NMNM82,013-0.5%−46.7 pts

16Chaves County, NMNM63,364-0.7%−6.9 pts

17Lincoln County, NMNM19,844-1.1%−60.0 pts

18Quay County, NMNM8,454-3.3%+2.9 pts

19Roosevelt County, NMNM18,615-3.3%−11.2 pts

20Sierra County, NMNM11,395-3.4%−37.3 pts

21Catron County, NMNM3,827-3.9%−42.2 pts

22Grant County, NMNM27,252-4.5%−16.5 pts

23Guadalupe County, NMNM4,343-5.0%−17.6 pts

24Harding County, NMNM617-5.5%+12.5 pts

25San Juan County, NMNM120,340-6.4%−30.7 pts

26Socorro County, NMNM15,838-7.1%−29.6 pts

27San Miguel County, NMNM26,260-7.5%−24.5 pts

28Torrance County, NMNM16,100-8.2%−72.6 pts

29Colfax County, NMNM12,184-9.9%−19.7 pts

30Union County, NMNM3,844-10.3%−11.5 pts

31Mora County, NMNM4,051-14.2%−35.7 pts

32Hidalgo County, NMNM3,929-14.6%−14.2 pts

33De Baca County, NMNM1,647-16.0%−15.5 pts

SHOWING 1–33 OF 33

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU DECENNIAL CENSUS