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Bernalillo County formed in 1852.
Catron County - formed in 1921
Chaves County- formed in 1889
Cibola County - formed in 1981
Colfax County - formed in 1869
Curry County - formed in 1909
De Baca County - formed in 1917
Doña Ana County - formed in 1852
Eddy County - formed in 1889
Grant County - formed in 1868
Guadalupe County - formed in 1891
Harding County - formed in 1921
Hidalgo County- formed in 1919
Lea County - formed in 1917
Lincoln County - formed in 1869
Los Alamos County - formed in 1949
Luna County - formed in 1901
McKinley County - formed in 1899
Mora County - formed in 1860
Otero County - formed in 1899
Quay County - formed in 1903
Rio Arriba County - formed in 1852
Roosevelt County - formed in 1903
San Juan County - formed in 1887
San Miguel County - formed in 1852.
Sandoval County - formed in 1903
Santa Fe County - formed in 1852.
Sierra County - formed in 1884
Socorro County - formed in 1852. Taos County - formed in 1852.
Torrance County - formed in 1903
Union County - formed in 1893
Valencia County - formed in 1852 Defunct County: |