County	Founded	Parent County	County Seat
BERNALILLO	1852	Original County	ALBUQUERQUE
CATRON	1921	Socorro	RESERVE
CHAVES	1887	Lincoln	ROSWELL
CIBOLA	1981	Valencia	GRANTS
COLFAX	1869	Taos	RATON
CURRY	1909	Quay, Roosevelt	CLOVIS
DE BACA	1917	Chaves, Guadalupe, Roosevelt	FORT SUMNER
DOÑA ANA	1852	Original County	LAS CRUCES
EDDY	1889	Lincoln	CARLSBAD
GRANT	1868	Doña Ana	SILVER CITY
GUADALUPE	1891	Lincoln, San Miguel	SANTA ROSA
HARDING	1921	Mora, Union	MOSQUERO
HIDALGO	1919	Grant	LORDSBURG
LEA	1917	Chaves, Eddy	LOVINGTON
LINCOLN	1869	Socorro, Dona Ana	CARRIZOZO
LOS ALAMOS	1949	Sandoval, Santa Fe	LOS ALAMOS
LUNA	1901	Doña Ana, Grant	DEMING
MCKINLEY	1899	Bernalillo, Valencia, San Juan, Rio Arriba	GALLUP
MORA	1860	Taos	MORA
OTERO	1899	Doña Ana, Lincoln, Socorro	ALAMOGORDO
QUAY	1903	Guadalupe	TUCUMCARI
RIO ARRIBA	1852	Original County	TIERRA AMARILLA
ROOSEVELT	1903	Chaves, Guadalupe	PORTALES
SAN JUAN	1887	Rio Arriba	AZTEC
SAN MIGUEL	1852	Original County	LAS VEGAS
SANDOVAL	1903	Bernalillo	BERNALILLO
SANTA ANA	1844	Original County	ALGODONES
SANTA FE	1852	Original County	SANTA FE
SIERRA	1884	Socorro	TRUTH OR CONSEQUENCES
SOCORRO	1852	Original County	SOCORRO
TAOS	1852	Original County	TAOS
TORRANCE	1903	Lincoln, San Miguel, Socorro, Santa Fe, Valencia	ESTANCIA
UNION	1893	Colfax, Mora, San Miguel	CLAYTON
VALENCIA	1852	Original County	LOS LUNAS