RANKING · 2010 CENSUS · 33 SHOWN OF 33

Fastest shrinking, New Mexico counties · 2010

New Mexico counties with the steepest population decline since the prior decennial census. 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

YEAR2000 2010 2020

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Hidalgo County, NMNM3,929-17.5%+3910%

02Harding County, NMNM617-14.2%−21%

03Quay County, NMNM8,454-11.0%+78%

04De Baca County, NMNM1,647-9.7%+1726%

05Sierra County, NMNM11,395-9.7%−129%

06Mora County, NMNM4,051-5.8%−127%

07Grant County, NMNM27,252-4.8%−140%

08McKinley County, NMNM68,119-4.4%−119%

09Torrance County, NMNM16,100-3.1%−105%

10Colfax County, NMNM12,184-3.1%−132%

11San Miguel County, NMNM26,260-2.4%−114%

12Rio Arriba County, NMNM39,832-2.3%−112%

13Los Alamos County, NMNM19,407-2.1%−270%

14Socorro County, NMNM15,838-1.2%−105%

15Guadalupe County, NMNM4,343+0.1%−99%

16Luna County, NMNM25,407+0.3%−99%

17Otero County, NMNM70,368+2.4%−88%

18Eddy County, NMNM62,509+4.2%−33%

19Catron County, NMNM3,827+5.1%−87%

20Lincoln County, NMNM19,844+5.6%−90%

21Cibola County, NMNM26,807+6.3%−16%

22Chaves County, NMNM63,364+6.9%+14%

23Curry County, NMNM46,655+7.4%+10%

24Union County, NMNM3,844+9.0%+641%

25Taos County, NMNM34,564+9.9%−67%

26Roosevelt County, NMNM18,615+10.1%+29%

27Santa Fe County, NMNM156,907+11.5%−63%

28San Juan County, NMNM120,340+14.3%−41%

29Valencia County, NMNM82,013+15.7%−66%

30Lea County, NMNM74,749+16.6%−3745%

31Bernalillo County, NMNM667,601+19.0%+20%

32Doña Ana County, NMNM229,091+19.8%−32%

33Sandoval County, NMNM159,565+46.3%+10%

SHOWING 1–33 OF 33

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES