RANKING · 2000 CENSUS · 33 SHOWN OF 33

Oldest by median age, New Mexico counties · 2000

New Mexico counties ranked by median age of residents (2000 ACS). 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 ZIP codes

RELATEDLargest foreign-born population Most residents with a disability Largest veteran population Most uninsured people Largest senior population Most unmarried people

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 1990

01Sierra County, NMNM11,39548.9−5%

02Harding County, NMNM61748.7+28%

03Catron County, NMNM3,82747.8+27%

04De Baca County, NMNM1,64743.8+6%

05Lincoln County, NMNM19,84443.8+17%

06Quay County, NMNM8,45441.5+14%

07Colfax County, NMNM12,18440.8+15%

08Los Alamos County, NMNM19,40740.8+8%

09Union County, NMNM3,84439.9+8%

10Mora County, NMNM4,05139.6+15%

11Taos County, NMNM34,56439.5+16%

12Grant County, NMNM27,25238.8+17%

13Santa Fe County, NMNM156,90737.9+10%

14Guadalupe County, NMNM4,34337.5+15%

15Luna County, NMNM25,40736.7+1%

16Eddy County, NMNM62,50936.4+9%

17Chaves County, NMNM63,36435.2+11%

18San Miguel County, NMNM26,26035.1+15%

19Sandoval County, NMNM159,56535.1+14%

20Bernalillo County, NMNM667,60135.0+8%

21Hidalgo County, NMNM3,92934.8+15%

22Torrance County, NMNM16,10034.8+7%

23Rio Arriba County, NMNM39,83234.5+15%

24Otero County, NMNM70,36833.8+16%

25Valencia County, NMNM82,01333.8+7%

26Cibola County, NMNM26,80733.1+10%

27Lea County, NMNM74,74933.1+9%

28Socorro County, NMNM15,83832.4+8%

29San Juan County, NMNM120,34031.0+9%

30Curry County, NMNM46,65530.8+5%

31Doña Ana County, NMNM229,09130.2+7%

32Roosevelt County, NMNM18,61529.5−1%

33McKinley County, NMNM68,11926.9+5%

SHOWING 1–33 OF 33

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