RANKING · 2020 CENSUS · 33 SHOWN OF 33

Youngest by median age, New Mexico counties · 2020

New Mexico counties with the youngest median age (2020 ACS). This list covers the 33 counties in New Mexico that qualify, ranked against each other statewide. The median across all 33 is 42.0.

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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 2000

01Roosevelt County, NMNM18,61531.8+8%

02Lea County, NMNM74,74932.3−2%

03Curry County, NMNM46,65532.8+6%

04McKinley County, NMNM68,11934.4+28%

05Eddy County, NMNM62,50935.5−2%

06Doña Ana County, NMNM229,09136.0+19%

07Chaves County, NMNM63,36436.1+3%

08San Juan County, NMNM120,34036.5+18%

09Otero County, NMNM70,36837.0+9%

10Cibola County, NMNM26,80738.5+16%

11Socorro County, NMNM15,83838.6+19%

12Bernalillo County, NMNM667,60138.9+11%

13Luna County, NMNM25,40739.8+8%

14Valencia County, NMNM82,01339.8+18%

15Sandoval County, NMNM159,56541.2+17%

16Los Alamos County, NMNM19,40741.5+2%

17Guadalupe County, NMNM4,34342.0+12%

18Hidalgo County, NMNM3,92943.5+25%

19Rio Arriba County, NMNM39,83243.5+26%

20Union County, NMNM3,84443.6+9%

21San Miguel County, NMNM26,26044.3+26%

22Torrance County, NMNM16,10045.5+31%

23Quay County, NMNM8,45447.5+14%

24Santa Fe County, NMNM156,90747.9+26%

25Grant County, NMNM27,25249.3+27%

26Colfax County, NMNM12,18450.0+23%

27Taos County, NMNM34,56450.0+27%

28De Baca County, NMNM1,64751.5+18%

29Lincoln County, NMNM19,84453.0+21%

30Mora County, NMNM4,05153.8+36%

31Sierra County, NMNM11,39557.3+17%

32Harding County, NMNM61758.4+20%

33Catron County, NMNM3,82761.9+29%

SHOWING 1–33 OF 33

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS