NEW MEXICO
Browse New Mexico County Histories
Click on a county to see its history. Jurisdictions with resources have a green border. Those displayed in gray are counties that are no longer active under their original designation; to delve deeper into the various reasons for their change, please visit our Understanding Extinct Counties page.
BERNALILLO COUNTY
CATRON COUNTY
CHAVES COUNTY
CIBOLA COUNTY
COLFAX COUNTY
CURRY COUNTY
DE BACA COUNTY
DOÑA ANA COUNTY
EDDY COUNTY
GRANT COUNTY
GUADALUPE COUNTY
(RENAMED COUNTY FROM 1917–1921) HARDING COUNTY HIDALGO COUNTY LEA COUNTY LEONARD WOOD COUNTY
(EXTINCT, 1917–1921) LINCOLN COUNTY LOS ALAMOS COUNTY LUNA COUNTY MCKINLEY COUNTY MESILLA COUNTY
(EXTINCT, 1854–1863) MORA COUNTY OTERO COUNTY QUAY COUNTY RIO ARRIBA COUNTY ROOSEVELT COUNTY SANDOVAL COUNTY SAN JUAN COUNTY SAN MIGUEL COUNTY SANTA ANA COUNTY
(EXTINCT, 1852–1876) SANTA FE COUNTY SIERRA COUNTY SOCORRO COUNTY TAOS COUNTY TORRANCE COUNTY UNION COUNTY VALENCIA COUNTY
(RENAMED COUNTY FROM 1917–1921) HARDING COUNTY HIDALGO COUNTY LEA COUNTY LEONARD WOOD COUNTY
(EXTINCT, 1917–1921) LINCOLN COUNTY LOS ALAMOS COUNTY LUNA COUNTY MCKINLEY COUNTY MESILLA COUNTY
(EXTINCT, 1854–1863) MORA COUNTY OTERO COUNTY QUAY COUNTY RIO ARRIBA COUNTY ROOSEVELT COUNTY SANDOVAL COUNTY SAN JUAN COUNTY SAN MIGUEL COUNTY SANTA ANA COUNTY
(EXTINCT, 1852–1876) SANTA FE COUNTY SIERRA COUNTY SOCORRO COUNTY TAOS COUNTY TORRANCE COUNTY UNION COUNTY VALENCIA COUNTY