RANKING · 2025 ESTIMATES · 33 SHOWN OF 33

Most population lost, New Mexico counties

New Mexico counties that lost 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.

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New MexicoAll states All rankings

SAME RANKING BYCities States Metros

YEAR2000 2010 2020 2025

RANKPLACESTATEPOPPOPULATION CHANGEVS 2000

01Bernalillo County, NMNM667,601-8,843−112%

02McKinley County, NMNM68,119-4,783−134%

03Chaves County, NMNM63,364-1,793−151%

04Curry County, NMNM46,655-1,775−163%

05San Juan County, NMNM120,340-1,321−106%

06San Miguel County, NMNM26,260-941−121%

07Grant County, NMNM27,252-933−128%

08Socorro County, NMNM15,838-757−123%

09Roosevelt County, NMNM18,615-576−144%

10Rio Arriba County, NMNM39,832-531−108%

11Lincoln County, NMNM19,844-425−106%

12Cibola County, NMNM26,807-365−120%

13Quay County, NMNM8,454-292−56%

14Hidalgo County, NMNM3,929-249+858%

15Union County, NMNM3,844-235−570%

16Colfax County, NMNM12,184-203−116%

17Sierra County, NMNM11,395-181−105%

18Mora County, NMNM4,051-138−115%

19Guadalupe County, NMNM4,343-109−121%

20De Baca County, NMNM1,647-51+325%

21Harding County, NMNM617-40−77%

22Luna County, NMNM25,407-20−100%

23Los Alamos County, NMNM19,407-12−105%

24Taos County, NMNM34,564+75−99%

25Eddy County, NMNM62,509+195−94%

26Catron County, NMNM3,827+248−75%

27Lea County, NMNM74,749+294−216%

28Torrance County, NMNM16,100+1,055−84%

29Santa Fe County, NMNM156,907+2,084−93%

30Otero County, NMNM70,368+2,529−76%

31Valencia County, NMNM82,013+5,808−72%

32Doña Ana County, NMNM229,091+9,530−76%

33Sandoval County, NMNM159,565+10,731−60%

SHOWING 1–33 OF 33

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UPDATED 2026-08-08 · DATA: US CENSUS BUREAU POPULATION ESTIMATES