RANKING · 2010 CENSUS · 33 SHOWN OF 33

Most population lost, New Mexico counties · 2010

New Mexico counties that lost the most residents from the 2000 census to 2010, by raw count of people rather than percentage. 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

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01McKinley County, NMNM68,119-3,306−123%

02Grant County, NMNM27,252-1,488−145%

03Sierra County, NMNM11,395-1,282−138%

04Quay County, NMNM8,454-1,114+67%

05Hidalgo County, NMNM3,929-1,038+3892%

06Rio Arriba County, NMNM39,832-944−114%

07San Miguel County, NMNM26,260-733−117%

08Torrance County, NMNM16,100-528−108%

09Colfax County, NMNM12,184-439−135%

10Los Alamos County, NMNM19,407-393−272%

11Mora County, NMNM4,051-299−133%

12De Baca County, NMNM1,647-218+1717%

13Socorro County, NMNM15,838-212−106%

14Harding County, NMNM617-115−35%

15Guadalupe County, NMNM4,343+7−99%

16Luna County, NMNM25,407+79−99%

17Catron County, NMNM3,827+182−81%

18Union County, NMNM3,844+375+650%

19Lincoln County, NMNM19,844+1,086−85%

20Otero County, NMNM70,368+1,499−86%

21Cibola County, NMNM26,807+1,618−10%

22Roosevelt County, NMNM18,615+1,828+39%

23Eddy County, NMNM62,509+2,171−29%

24Taos County, NMNM34,564+2,958−57%

25Curry County, NMNM46,655+3,332+17%

26Chaves County, NMNM63,364+4,263+21%

27Lea County, NMNM74,749+9,216−3728%

28Valencia County, NMNM82,013+10,417−50%

29Santa Fe County, NMNM156,907+14,878−51%

30San Juan County, NMNM120,340+16,243−27%

31Doña Ana County, NMNM229,091+34,551−12%

32Sandoval County, NMNM159,565+41,653+57%

33Bernalillo County, NMNM667,601+105,886+39%

SHOWING 1–33 OF 33

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