RANKING · 2025 ESTIMATES · 33 SHOWN OF 33

Most population gained, New Mexico counties

New Mexico counties that added the most residents from the 2020 census to 2025, 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 -181. Biggest climber in the top 100 since 2020: Torrance County, NM, up 24 places to #6.

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New MexicoAll states All rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Sandoval County, NMNM159,565+10,731−60%

02▲2Doña Ana County, NMNM229,091+9,530−76%

03▲18Valencia County, NMNM82,013+5,808−72%

04▲3Otero County, NMNM70,368+2,529−76%

05▼2Santa Fe County, NMNM156,907+2,084−93%

06▲24Torrance County, NMNM16,100+1,055−84%

07▼2Lea County, NMNM74,749+294−216%

08▲8Catron County, NMNM3,827+248−75%

09▼3Eddy County, NMNM62,509+195−94%

10▼2Taos County, NMNM34,564+75−99%

11▼2Los Alamos County, NMNM19,407-12−105%

12▼1Luna County, NMNM25,407-20−100%

13▲1Harding County, NMNM617-40−77%

14▲6De Baca County, NMNM1,647-51+325%

15▲3Guadalupe County, NMNM4,343-109−121%

16▲10Mora County, NMNM4,051-138−115%

17▲5Sierra County, NMNM11,395-181−105%

18▲13Colfax County, NMNM12,184-203−116%

19▲4Union County, NMNM3,844-235−570%

20▲7Hidalgo County, NMNM3,929-249+858%

21▼2Quay County, NMNM8,454-292−56%

22▼7Cibola County, NMNM26,807-365−120%

23▼6Lincoln County, NMNM19,844-425−106%

24▼12Rio Arriba County, NMNM39,832-531−108%

25Roosevelt County, NMNM18,615-576−144%

26▲2Socorro County, NMNM15,838-757−123%

27▲2Grant County, NMNM27,252-933−128%

28▲4San Miguel County, NMNM26,260-941−121%

29▲4San Juan County, NMNM120,340-1,321−106%

30▼17Curry County, NMNM46,655-1,775−163%

31▼7Chaves County, NMNM63,364-1,793−151%

32▼22McKinley County, NMNM68,119-4,783−134%

33▼31Bernalillo County, NMNM667,601-8,843−112%

SHOWING 1–33 OF 33

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UPDATED 2026-09-11 · DATA: US CENSUS BUREAU POPULATION ESTIMATES