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%−15.5 pts

02Hidalgo County, NMNM3,929-14.6%−14.2 pts

03Mora County, NMNM4,051-14.2%−35.7 pts

04Union County, NMNM3,844-10.3%−11.5 pts

05Colfax County, NMNM12,184-9.9%−19.7 pts

06Torrance County, NMNM16,100-8.2%−72.6 pts

07San Miguel County, NMNM26,260-7.5%−24.5 pts

08Socorro County, NMNM15,838-7.1%−29.6 pts

09San Juan County, NMNM120,340-6.4%−30.7 pts

10Harding County, NMNM617-5.5%+12.5 pts

11Guadalupe County, NMNM4,343-5.0%−17.6 pts

12Grant County, NMNM27,252-4.5%−16.5 pts

13Catron County, NMNM3,827-3.9%−42.2 pts

14Sierra County, NMNM11,395-3.4%−37.3 pts

15Roosevelt County, NMNM18,615-3.3%−11.2 pts

16Quay County, NMNM8,454-3.3%+2.9 pts

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

18Chaves County, NMNM63,364-0.7%−6.9 pts

19Valencia County, NMNM82,013-0.5%−46.7 pts

20Cibola County, NMNM26,807-0.2%−7.7 pts

21Curry County, NMNM46,655+0.1%−6.6 pts

22Rio Arriba County, NMNM39,832+0.3%−19.6 pts

23Luna County, NMNM25,407+1.3%−36.8 pts

24McKinley County, NMNM68,119+2.0%−21.3 pts

25Bernalillo County, NMNM667,601+2.1%−13.7 pts

26Taos County, NMNM34,564+4.7%−25.0 pts

27Doña Ana County, NMNM229,091+4.9%−24.0 pts

28Otero County, NMNM70,368+6.3%−13.6 pts

29Santa Fe County, NMNM156,907+7.4%−23.3 pts

30Los Alamos County, NMNM19,407+8.2%+6.9 pts

31Sandoval County, NMNM159,565+13.1%−28.9 pts

32Lea County, NMNM74,749+15.0%+15.5 pts

33Eddy County, NMNM62,509+15.8%+9.5 pts

SHOWING 1–33 OF 33

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