RANKING · 2000 CENSUS · 33 SHOWN OF 33

Most population gained, New Mexico counties · 2000

New Mexico counties that added the most residents from the 1990 census to 2000, by raw count of people rather than percentage. This list covers the 33 counties in New Mexico that qualify, ranked against each other statewide. The median across all 33 is +3,326.

Flip the list · Most population lost, US counties →

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SAME RANKING BYCities States Metros

RELATEDLargest by population Fastest growing Fastest shrinking Most population lost Most densely populated Most sparsely populated

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS –

01Bernalillo County, NMNM667,601+76,101–

02Doña Ana County, NMNM229,091+39,172–

03Santa Fe County, NMNM156,907+30,364–

04Sandoval County, NMNM159,565+26,589–

05San Juan County, NMNM120,340+22,196–

06Valencia County, NMNM82,013+20,917–

07McKinley County, NMNM68,119+14,112–

08Otero County, NMNM70,368+10,370–

09Lincoln County, NMNM19,844+7,192–

10Luna County, NMNM25,407+6,906–

11Taos County, NMNM34,564+6,861–

12Rio Arriba County, NMNM39,832+6,825–

13Torrance County, NMNM16,100+6,626–

14San Miguel County, NMNM26,260+4,383–

15Chaves County, NMNM63,364+3,533–

16Sierra County, NMNM11,395+3,358–

17Grant County, NMNM27,252+3,326–

18Socorro County, NMNM15,838+3,314–

19Eddy County, NMNM62,509+3,053–

20Curry County, NMNM46,655+2,837–

21Cibola County, NMNM26,807+1,801–

22Roosevelt County, NMNM18,615+1,316–

23Colfax County, NMNM12,184+1,264–

24Catron County, NMNM3,827+980–

25Mora County, NMNM4,051+916–

26Guadalupe County, NMNM4,343+524–

27Los Alamos County, NMNM19,407+228–

28Union County, NMNM3,844+50–

29De Baca County, NMNM1,647-12–

30Hidalgo County, NMNM3,929-26–

31Harding County, NMNM617-177–

32Lea County, NMNM74,749-254–

33Quay County, NMNM8,454-668–

SHOWING 1–33 OF 33

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU DECENNIAL CENSUS