RANKING · 1990 CENSUS · 33 SHOWN OF 33

Oldest by median age, New Mexico counties · 1990

New Mexico counties ranked by median age of residents (1990 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 –

01Sierra County, NMNM11,39551.3–

02De Baca County, NMNM1,64741.4–

03Harding County, NMNM61738.1–

04Los Alamos County, NMNM19,40737.8–

05Catron County, NMNM3,82737.7–

06Lincoln County, NMNM19,84437.4–

07Union County, NMNM3,84437.1–

08Quay County, NMNM8,45436.5–

09Luna County, NMNM25,40736.4–

10Colfax County, NMNM12,18435.5–

11Santa Fe County, NMNM156,90734.6–

12Mora County, NMNM4,05134.4–

13Taos County, NMNM34,56434.1–

14Eddy County, NMNM62,50933.4–

15Grant County, NMNM27,25233.1–

16Torrance County, NMNM16,10032.7–

17Guadalupe County, NMNM4,34332.5–

18Bernalillo County, NMNM667,60132.4–

19Chaves County, NMNM63,36431.8–

20Valencia County, NMNM82,01331.6–

21Sandoval County, NMNM159,56530.8–

22San Miguel County, NMNM26,26030.6–

23Lea County, NMNM74,74930.5–

24Hidalgo County, NMNM3,92930.3–

25Rio Arriba County, NMNM39,83230.1–

26Socorro County, NMNM15,83830.1–

27Cibola County, NMNM26,80730.0–

28Roosevelt County, NMNM18,61529.8–

29Curry County, NMNM46,65529.3–

30Otero County, NMNM70,36829.2–

31San Juan County, NMNM120,34028.3–

32Doña Ana County, NMNM229,09128.2–

33McKinley County, NMNM68,11925.5–

SHOWING 1–33 OF 33

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