RANKING · 2024 ACS · 33 SHOWN OF 33

Youngest by median age, New Mexico counties

New Mexico counties with the youngest median age (2024 ACS). This list covers the 33 counties in New Mexico that qualify, ranked against each other statewide. The median across all 33 is 40.3. Biggest climber in the top 100 since 2020: De Baca County, NM, up 22 places to #6.

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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

01▲2Curry County, NMNM46,65531.9+4%

02▼1Roosevelt County, NMNM18,61532.3+9%

03▼1Lea County, NMNM74,74932.5−2%

04▲2Doña Ana County, NMNM229,09134.3+14%

05▼1McKinley County, NMNM68,11934.6+29%

06▲22De Baca County, NMNM1,64735.3−19%

07▼2Eddy County, NMNM62,50936.2−1%

08▲5Luna County, NMNM25,40736.3−1%

09Otero County, NMNM70,36836.4+8%

10▼3Chaves County, NMNM63,36437.2+6%

11▲6Guadalupe County, NMNM4,34337.8+1%

12▼4San Juan County, NMNM120,34038.3+24%

13▲3Los Alamos County, NMNM19,40739.3−4%

14Valencia County, NMNM82,01339.4+17%

15▼3Bernalillo County, NMNM667,60139.5+13%

16▼6Cibola County, NMNM26,80740.0+21%

17▼6Socorro County, NMNM15,83840.3+24%

18▼3Sandoval County, NMNM159,56541.3+18%

19Rio Arriba County, NMNM39,83242.0+22%

20▲12Harding County, NMNM61742.5−13%

21▼3Hidalgo County, NMNM3,92942.6+22%

22▼2Union County, NMNM3,84442.6+7%

23▼1Torrance County, NMNM16,10043.3+24%

24▼3San Miguel County, NMNM26,26047.2+34%

25▼1Santa Fe County, NMNM156,90748.7+28%

26▼3Quay County, NMNM8,45448.9+18%

27▼1Colfax County, NMNM12,18449.1+20%

28▼3Grant County, NMNM27,25249.5+28%

29Lincoln County, NMNM19,84452.4+20%

30▼3Taos County, NMNM34,56452.6+33%

31▼1Mora County, NMNM4,05155.1+39%

32▼1Sierra County, NMNM11,39557.6+18%

33Catron County, NMNM3,82763.8+33%

SHOWING 1–33 OF 33

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES