RANKING · 2024 ACS · 33 SHOWN OF 33

Oldest by median age, New Mexico counties

New Mexico counties ranked by median age of residents (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: Socorro County, NM, up 6 places to #17.

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New MexicoAll states All rankings

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

01Catron County, NMNM3,82763.8+33%

02▲1Sierra County, NMNM11,39557.6+18%

03▲1Mora County, NMNM4,05155.1+39%

04▲4Taos County, NMNM34,56452.6+33%

05Lincoln County, NMNM19,84452.4+20%

06▲3Grant County, NMNM27,25249.5+28%

07Colfax County, NMNM12,18449.1+20%

08▲3Quay County, NMNM8,45448.9+18%

09▲1Santa Fe County, NMNM156,90748.7+28%

10▲3San Miguel County, NMNM26,26047.2+34%

11▲1Torrance County, NMNM16,10043.3+24%

12▲3Hidalgo County, NMNM3,92942.6+22%

13▲1Union County, NMNM3,84442.6+7%

14▼12Harding County, NMNM61742.5−13%

15▲1Rio Arriba County, NMNM39,83242.0+22%

16▲3Sandoval County, NMNM159,56541.3+18%

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

18▲6Cibola County, NMNM26,80740.0+21%

19▲3Bernalillo County, NMNM667,60139.5+13%

20▲1Valencia County, NMNM82,01339.4+17%

21▼3Los Alamos County, NMNM19,40739.3−4%

22▲4San Juan County, NMNM120,34038.3+24%

23▼6Guadalupe County, NMNM4,34337.8+1%

24▲3Chaves County, NMNM63,36437.2+6%

25Otero County, NMNM70,36836.4+8%

26▼6Luna County, NMNM25,40736.3−1%

27▲2Eddy County, NMNM62,50936.2−1%

28▼22De Baca County, NMNM1,64735.3−19%

29▲1McKinley County, NMNM68,11934.6+29%

30▼2Doña Ana County, NMNM229,09134.3+14%

31▲1Lea County, NMNM74,74932.5−2%

32▲1Roosevelt County, NMNM18,61532.3+9%

33▼2Curry County, NMNM46,65531.9+4%

SHOWING 1–33 OF 33

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