Fastest Growing Counties in New Mexico (2025)

County
Rank
Change (2020)
2025 Pop.
2020 Pop.
Catron County17.85%3,8893,606
Sandoval County27.59%160,614149,290
Torrance County37.11%16,13315,062
Valencia County46.08%81,02176,374
Doña Ana County53.87%228,570220,060
Otero County62.37%69,47167,862
Los Alamos County71.9%19,78619,418
Santa Fe County80.84%156,346155,043
Sierra County9-0.4%11,51611,562
San Juan County10-0.4%120,887121,376
Colfax County11-1.06%12,22112,352
Bernalillo County12-1.18%668,844676,853
Taos County13-1.24%34,03534,463
Rio Arriba County14-1.55%39,64640,271
Cibola County15-1.86%26,59827,101
Roosevelt County16-2.63%18,64519,148
Quay County17-2.75%8,4728,712
Mora County18-2.77%4,0754,191
Eddy County19-3.07%60,41962,333
Curry County20-3.23%46,80648,370
San Miguel County21-3.43%26,20027,131
Chaves County22-3.45%62,89965,149
Union County23-3.51%3,9284,071
Luna County24-3.52%24,56225,458
Harding County25-3.52%630653
Lea County26-4.05%71,61774,642
Grant County27-4.17%27,03028,205
Guadalupe County28-4.39%4,2444,439
Lincoln County29-4.46%19,40120,307
Socorro County30-5.34%15,66716,551
De Baca County31-5.59%1,5871,681
Hidalgo County32-6.99%3,8734,164
McKinley County33-8.35%66,52972,590

New Mexico County Growth Overview

New Mexico's counties show varied growth patterns from 2020 to 2025. Catron County leads with 7.85% annualized growth, followed by Sandoval County (7.59%) and Torrance County (7.11%). The largest counties are Bernalillo County (668,844), Doña Ana County (228,570), and Sandoval County (160,614). Of the 33 counties in New Mexico, 8 are growing while 25 have experienced population decline. Overall, counties averaged -1.37% annualized growth, with total population growing by -0.11% annually.