RANKING · 2010 CENSUS · 33 SHOWN OF 33

Fastest growing, New Mexico counties · 2010

New Mexico counties ranked by population growth 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

RELATEDLargest by population Fastest shrinking Most densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR2000 2010 2020

RANKPLACESTATEPOPPOPULATION GROWTHVS 2000

01Sandoval County, NMNM159,565+46.3%+10%

02Doña Ana County, NMNM229,091+19.8%−32%

03Bernalillo County, NMNM667,601+19.0%+20%

04Lea County, NMNM74,749+16.6%−3745%

05Valencia County, NMNM82,013+15.7%−66%

06San Juan County, NMNM120,340+14.3%−41%

07Santa Fe County, NMNM156,907+11.5%−63%

08Roosevelt County, NMNM18,615+10.1%+29%

09Taos County, NMNM34,564+9.9%−67%

10Union County, NMNM3,844+9.0%+641%

11Curry County, NMNM46,655+7.4%+10%

12Chaves County, NMNM63,364+6.9%+14%

13Cibola County, NMNM26,807+6.3%−16%

14Lincoln County, NMNM19,844+5.6%−90%

15Catron County, NMNM3,827+5.1%−87%

16Eddy County, NMNM62,509+4.2%−33%

17Otero County, NMNM70,368+2.4%−88%

18Luna County, NMNM25,407+0.3%−99%

19Guadalupe County, NMNM4,343+0.1%−99%

20Socorro County, NMNM15,838-1.2%−105%

21Los Alamos County, NMNM19,407-2.1%−270%

22Rio Arriba County, NMNM39,832-2.3%−112%

23San Miguel County, NMNM26,260-2.4%−114%

24Colfax County, NMNM12,184-3.1%−132%

25Torrance County, NMNM16,100-3.1%−105%

26McKinley County, NMNM68,119-4.4%−119%

27Grant County, NMNM27,252-4.8%−140%

28Mora County, NMNM4,051-5.8%−127%

29Sierra County, NMNM11,395-9.7%−129%

30De Baca County, NMNM1,647-9.7%+1726%

31Quay County, NMNM8,454-11.0%+78%

32Harding County, NMNM617-14.2%−21%

33Hidalgo County, NMNM3,929-17.5%+3910%

SHOWING 1–33 OF 33

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