RANKING · 1990 CENSUS · 33 SHOWN OF 33

Largest by population, New Mexico counties · 1990

The most populous us counties as of the 2023 estimates. This list covers the 33 counties in New Mexico that qualify, ranked against each other statewide.

New MexicoAll states All rankings

SAME RANKING BYCities States Metros ZIP codes

RELATEDFastest growing Fastest shrinking Most densely populated Most sparsely populated Best broadband access Worst broadband access

YEAR1990 2000 2010 2020 2025

RANKPLACESTATEPOPTOTAL POPULATIONVS 2000

01Bernalillo County, NMNM667,601480,577−14%

02Doña Ana County, NMNM229,091135,510−22%

03Santa Fe County, NMNM156,90798,928−23%

04San Juan County, NMNM120,34091,605−20%

05Sandoval County, NMNM159,56563,319−30%

06McKinley County, NMNM68,11960,686−19%

07Chaves County, NMNM63,36457,849−6%

08Lea County, NMNM74,74955,765+0%

09Otero County, NMNM70,36851,928−17%

10Eddy County, NMNM62,50948,605−6%

11Valencia County, NMNM82,01345,235−32%

12Curry County, NMNM46,65542,207−6%

13Rio Arriba County, NMNM39,83234,365−17%

14Grant County, NMNM27,25227,676−11%

15San Miguel County, NMNM26,26025,743−15%

16Cibola County, NMNM26,80723,794−7%

17Taos County, NMNM34,56423,118−23%

18Los Alamos County, NMNM19,40718,115−1%

19Luna County, NMNM25,40718,110−28%

20Roosevelt County, NMNM18,61516,702−7%

21Socorro County, NMNM15,83814,764−18%

22Colfax County, NMNM12,18412,925−9%

23Lincoln County, NMNM19,84412,219−37%

24Quay County, NMNM8,45410,823+7%

25Torrance County, NMNM16,10010,285−39%

26Sierra County, NMNM11,3959,912−25%

27Hidalgo County, NMNM3,9295,958+0%

28Mora County, NMNM4,0514,264−18%

29Guadalupe County, NMNM4,3434,156−11%

30Union County, NMNM3,8444,124−1%

31Catron County, NMNM3,8272,563−28%

32De Baca County, NMNM1,6472,252+1%

33Harding County, NMNM617987+22%

SHOWING 1–33 OF 33

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