RANKING · 1990 CENSUS · 33 SHOWN OF 33

Oldest by median age, New Mexico counties · 1990

New Mexico counties ranked by median age of residents (2023 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

RELATEDYoungest by median age Most foreign-born residents Highest uninsured rate Most women Most men Highest disability rate

YEAR1990 2000 2010 2020 2024

RANKPLACESTATEPOPMEDIAN AGEVS 2000

01Sierra County, NMNM11,39551.3+5%

02De Baca County, NMNM1,64741.4−5%

03Harding County, NMNM61738.1−22%

04Los Alamos County, NMNM19,40737.8−7%

05Catron County, NMNM3,82737.7−21%

06Lincoln County, NMNM19,84437.4−15%

07Union County, NMNM3,84437.1−7%

08Quay County, NMNM8,45436.5−12%

09Luna County, NMNM25,40736.4−1%

10Colfax County, NMNM12,18435.5−13%

11Santa Fe County, NMNM156,90734.6−9%

12Mora County, NMNM4,05134.4−13%

13Taos County, NMNM34,56434.1−14%

14Eddy County, NMNM62,50933.4−8%

15Grant County, NMNM27,25233.1−15%

16Torrance County, NMNM16,10032.7−6%

17Guadalupe County, NMNM4,34332.5−13%

18Bernalillo County, NMNM667,60132.4−8%

19Chaves County, NMNM63,36431.8−10%

20Valencia County, NMNM82,01331.6−7%

21Sandoval County, NMNM159,56530.8−12%

22San Miguel County, NMNM26,26030.6−13%

23Lea County, NMNM74,74930.5−8%

24Hidalgo County, NMNM3,92930.3−13%

25Rio Arriba County, NMNM39,83230.1−13%

26Socorro County, NMNM15,83830.1−7%

27Cibola County, NMNM26,80730.0−9%

28Roosevelt County, NMNM18,61529.8+1%

29Curry County, NMNM46,65529.3−5%

30Otero County, NMNM70,36829.2−14%

31San Juan County, NMNM120,34028.3−9%

32Doña Ana County, NMNM229,09128.2−7%

33McKinley County, NMNM68,11925.5−5%

SHOWING 1–33 OF 33

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UPDATED 2026-06-02 · DATA: US CENSUS BUREAU ACS 5-YEAR ESTIMATES