RANKING · 2010 CENSUS · 33 SHOWN OF 33

Most population gained, New Mexico counties · 2010

New Mexico counties that added 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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New MexicoAll states All rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Bernalillo County, NMNM667,601+105,886+39%

02Sandoval County, NMNM159,565+41,653+57%

03Doña Ana County, NMNM229,091+34,551−12%

04San Juan County, NMNM120,340+16,243−27%

05Santa Fe County, NMNM156,907+14,878−51%

06Valencia County, NMNM82,013+10,417−50%

07Lea County, NMNM74,749+9,216−3728%

08Chaves County, NMNM63,364+4,263+21%

09Curry County, NMNM46,655+3,332+17%

10Taos County, NMNM34,564+2,958−57%

11Eddy County, NMNM62,509+2,171−29%

12Roosevelt County, NMNM18,615+1,828+39%

13Cibola County, NMNM26,807+1,618−10%

14Otero County, NMNM70,368+1,499−86%

15Lincoln County, NMNM19,844+1,086−85%

16Union County, NMNM3,844+375+650%

17Catron County, NMNM3,827+182−81%

18Luna County, NMNM25,407+79−99%

19Guadalupe County, NMNM4,343+7−99%

20Harding County, NMNM617-115−35%

21Socorro County, NMNM15,838-212−106%

22De Baca County, NMNM1,647-218+1717%

23Mora County, NMNM4,051-299−133%

24Los Alamos County, NMNM19,407-393−272%

25Colfax County, NMNM12,184-439−135%

26Torrance County, NMNM16,100-528−108%

27San Miguel County, NMNM26,260-733−117%

28Rio Arriba County, NMNM39,832-944−114%

29Hidalgo County, NMNM3,929-1,038+3892%

30Quay County, NMNM8,454-1,114+67%

31Sierra County, NMNM11,395-1,282−138%

32Grant County, NMNM27,252-1,488−145%

33McKinley County, NMNM68,119-3,306−123%

SHOWING 1–33 OF 33

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