New Mexico County Creation Dates and Parent Counties

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Note
 See an interactive outline map of New Mexico Historical Counties at Newberry Library site.[1] Select a year and the map will display the historical county boundaries. Click on map image for county details.


Tip: Sort the table by Date Formed or by Parent Counties and check Boundary Changes for interesting insights.
Name of County Date Formed Boundary
Changes 		Parent County Counties Created by Boundary Changes
Arizona 1860 Feb 1 Details Dona Ana Discontinued 1863
Bernalillo 1852 Jan 6 Details New Mexico Territory McKinley 1899
Catron 1921 Feb 25 Details Socorro none
Chaves 1889 Feb 25 Details Lincoln De Baca 1917, Lea 1917, Quay 1903, Roosevelt 1903
Colfax 1869 Jan 25 Details Mora Union 1893
Curry 1909 Feb 25 Details Quay, Roosevelt none
De Baca 1917 Feb 28 Details Chaves, Guadalupe none
Dona Ana 1852 Jan 6 Details New Mexico Territory Luna 1901, Otero 1899
Eddy 1889 Feb 25 Details Lincoln Lea 1917
Grant 1868 Jan 30 Details Socorro Hidalgo 1919, Luna 1901
Guadalupe 1891 Feb 26 Details Lincoln, San Miguel De Baca 1917
Harding 1921 Mar 4 Details Mora, Union none
Hidalgo 1919 Feb 25 Details Grant none
Lea 1917 Mar 7 Details Chaves, Eddy none
Lincoln 1869 Jan 16 Details Socorro Chaves 1889, Eddy 1889, Otero 1899, Guadalupe 1891, Torrance 1903
Los Alamos 1949 Mar 16 Details Sandoval, Santa Fe none
Luna 1901 Mar 16 Details Dona Ana, Grant none
McKinley 1899 Feb 23 Details Bernalillo, Valencia, San Juan, Rio Arriba none
Mora 1860 Feb 1 Details San Miguel Colfax 1869, Harding 1921, Union 1893
Otero 1899 Jan 30 Details Dona Ana, Lincoln, Socorro none
Quay 1903 Feb 28 Details Chaves Curry 1909
Rio Arriba 1852 Jan 6 Details New Mexico Territory Sandoval 1903, San Juan 1887
Roosevelt 1903 Feb 28 Details Chaves Curry 1909
Sandoval 1903 Mar 10 Details Rio Arriba Los Alamos 1949
San Juan 1877 Feb 24 Details Rio Arriba McKinley 1899
San Miguel 1852 Jan 6 Details New Mexico Territory Guadalupe 1891, Mora 1860, Torrance 1903, Union 1893
Santa Ana 1852 Jan 6 Details New Mexico Territory Discontinued 1876
Santa Fe 1852 Jan 6 Details New Mexico Territory Los Alamos 1949, Torrance 1903
Sierra 1884 Apr 3 Details Socorro none
Socorro 1852 Jan 6 Details New Mexico Territory Sierra 1884, Torrance 1903, Catron 1921, Grant 1868, Lincoln 1869, Otero 1899
Taos 1852 Jan 6 Details New Mexico Territory none
Torrance 1903 Mar 16 Details Lincoln, San Miguel, Santa Fe, Valencia, Socorro none
Union 1893 Feb 23 Details Colfax, Mora, San Miguel Harding 1921
Valencia 1852 Jan 6 Details New Mexico Territory McKinley 1899, Torrance 1903

References[edit | edit source]

  1. ↑ New Mexico Atlas of Historical County Boundaries, John H. Long, Editor; Peggy Tuck Sinko, Associate Editor; Gordon DenBoer, Historical Compiler; Douglas Knox, Book Digitizing Director and Digital Compiler; Emily Kelley, Research Associate; Laura Rico-Beck, GIS Specialist; Peter Siczewicz, ArcIMS Interactive Map Designer; Robert Will, Cartographic Assistant. Copyright The Newberry Library 2008.
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