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LIST BY COUNTY 

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  • BERNALILLO County

    • Founded 1852 ​

    • County Seat: Albuquerque

    • Largest City: Albuquerque 

  • CATRON County â€‹

    • Founded February 25, 1921​

    • County Seat: Reserve

    • Largest City: Reserve

    • Named for Thomas B. Catron 

  • CHAVES County

    • ​Founded February 25, 1889

    • County Seat: Roswell

    • Largest City: Roswell

    • Named for Jose Francisco Chavez  

  • CIBOLA county

    • ​Founded June 19, 1981

    • County Seat: Grants

    • Largest City: Grants

    • Named for Mythical Seven Cities of Cibola

  • COLFAX county

    • ​Founded January 25, 1869

    • County Seat: Raton

    • Named for Schuyler Colfax 

  • CURRY county

    • ​Founded February 25, 1909

    • County Seat: Clovis

    • Largest City: Clovis

    • Named for George Curry

  • DE BACA county

    • ​Founded February 28, 1917

    • County Seat: Fort Sumner 

    • Largest City: Village of Fort Sumner

    • Named for Ezequiel Cabeza De Baca 

  • DONA ANA county 

    • ​Founded 1852

    • County Seat: Las Cruces

    • Largest City: Las Cruces 

  • EDDY county

    • ​Founded May 16, 1891

    • County Seat: Carlsbad

    • Largest City: Carlsbad

    • Named for Charles Eddy, a local rancher 

  • GRANT county

    • ​Founded 1868

    • County Seat: Silver City 

    • Largest City: Silver City

    • Named for Ulysses S. Grant 

  • GUADALUPE county

    • ​Founded February 26, 1891

    • County Seat: Santa Rosa

    • Largest City: Santa Rosa

    • Named for Our Lady of Guadalupe 

  • Harding county

    • Founded March 4, 1921

    • County Seat: Mosquero

    • Largest City: Village of Roy

    • Named for Warren G. Harding 

  • Hidalgo county 

    • ​Founded January 1, 1920

    • County Seat: Lordsburg

    • Largest City: Lordsburg

    • Named for Villa de Guadalupe Hidalgo

  • Lea county

    • Founded March 17, 1917

    • County Seat: Lovington

    • Largest City: Hobbs

  • Lincoln county 

    • ​Founded 1869 

    • County Seat: Carrizozo

    • Largest City: Ruidoso

    • Named for Abraham Lincoln 

  • Los Alamos county

    • Founded 1949

    • County Seat: Los Alamos

    • Largest City: Los Alamos 

  • Luna county

    • ​Founded March 16, 1901

    • County Seat: Deming 

    • Largest City: Deming

    • Named for Solomon Luna

  • McKinley County

    • Founded January 1, 1901

    • County Seat: Gallup

    • Largest City: Gallup

    • Named for William McKinley 

  • Mora county

    • ​Founded February 1, 1860

    • County Seat: Mora

    • Largest Village: Mora 

    • Named for Mora, New Mexico 

  • Otero county

    • Founded January 30, 1899

    • County Seat: Alamogordo 

    • Largest City: Alamogordo

    • Named for Miguel Antonio Otero

  • Quay county

    • ​Founded February 28, 1903

    • County Seat: Tucumcari 

    • Largest City: Tucumcari

    • Named for Matthew Quay

  • Rio Arriba county

    • ​Founded 1852

    • County Seat: Tierra Amarilla

    • Largest City: Espanola 

    • Named for location on the upper Rio Grande (rio arriba means "upriver" in Spanish) 

  • Roosevelt county 

    • ​Founded February 28, 1903

    • County Seat: Portales

    • Largest City: Portales 

    • Named for Theodore Roosevelt 

  • San Juan county 

    • Founded February 24, 1887

    • County Seat: Aztec

    • Largest City: Farmington 

    • Named for San Juan River 

  • San Miguel county

    • Founded January 9, 1852 ​

    • County Seat: Las Vegas

    • Largest City: Las Vegas

    • Named for San Miguel del Vado 

  • Sandoval county

    • Founded 1903​

    • County Seat: Bernalillo

    • Largest City: Rio Rancho

    • Named for Sandoval family 

  • Santa Fe County

    • Founded​ 1852

    • County Seat: Santa Fe 

    • Largest City: Santa Fe

  • Sierra County

    • Founded 1884​

    • County Seat: Truth or Consequences 

    • Largest City: Truth or Consequences 

    • Named for the Black Range (Spanish: Sierra Diablo) 

  • Socorro county

    • Founded ​January 9, 1852

    • County Seat: Socorro

    • Largest City: Socorro

  • Taos county

    • Founded January 9, 1852​

    • County Seat: Taos

    • Largest City: Taos 

  • Torrance county

    • Founded March 16, 1903​

    • County Seat: Estancia

    • Largest City: Moriarty 

  • Union county

    • Founded January 1, 1894​

    • County Seat: Clayton

    • Largest City: Clayton

  • Valencia county 

    • Founded January 9, 1852​

    • County Seat: Los Lunas

    • Largest City: Los Lunas

    • Named for Valencia, New Mexico 

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