PlainCities

Counties · New Mexico

Counties of New Mexico

New Mexico has 33 counties. Bernalillo County is the largest with 667,601 residents in 2025. 10 of the 33 gained residents between 2020 and 2025 by the Census Bureau's estimates.

What counties are in New Mexico?

Sorted by the 2025 population estimate; sort by any column.

Counties of New Mexico: 2025 estimate, change since 2020, ACS 2020-2024 5-year estimates
Bernalillo County667,601−1.3%25176$69,473$292,900
Doña Ana County229,091+4.3%3061$56,848$220,800
Sandoval County159,565+7.2%2735$86,636$313,800
Santa Fe County156,907+1.3%5557$79,071$446,300
San Juan County120,340−1.1%3736$55,872$193,800
Valencia County82,013+7.4%2125$58,933$223,000
Lea County74,749+0.4%818$68,015$184,000
Otero County70,368+3.7%1721$55,876$162,700
McKinley County68,119−6.5%4433$47,668$78,700
Chaves County63,364−2.8%517$52,938$156,400
Eddy County62,509+0.3%1213$78,426$212,600
Curry County46,655−3.7%514$57,309$171,200
Rio Arriba County39,832−1.3%4111$57,155$243,700
Taos County34,564+0.2%1710$58,950$382,800
Grant County27,252−3.3%2610$44,958$175,600
Cibola County26,807−0.9%349$50,759$125,400
San Miguel County26,260−3.5%1510$49,431$188,500
Luna County25,407−0.0%117$36,419$128,000
Lincoln County19,844−2.1%69$53,303$233,200
Los Alamos County19,407−0.0%24$147,139$495,800
Roosevelt County18,615−3.0%55$52,685$135,800
Torrance County16,100+7.0%145$57,842$159,700
Socorro County15,838−4.6%166$36,570$137,500
Colfax County12,184−1.6%73$53,554$167,200
Sierra County11,395−1.5%114$41,600$152,600
Quay County8,454−3.3%53$41,946$87,200
Guadalupe County4,343−2.5%71$42,750$110,000
Mora County4,051−3.2%32$53,663$122,600
Hidalgo County3,929−5.9%82$48,882$111,000
Union County3,844−5.8%51$46,694$122,700
Catron County3,827+6.9%182$49,864$167,000
De Baca County1,647−3.2%21not published$187,500
Harding County617−5.7%21$48,553$70,000

Source: PEP Vintage 2025 (CO-EST2025); American Community Survey 2020-2024 5-year estimates, U.S. Census Bureau (released January 2026) · Census population estimates

How these figures are made: methodology and release checks · reading a margin of error · every state · corrections