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New Mexico Counties
New Mexico County map
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New Mexico Counties

There is thirty-three counties in the state of New Mexico. There were originally nine counties formed in 1852. Santa Ana County, New Mexico Territory, one of the nine original counties, was annexed in 1876 to Bernalillo County, New Mexico.

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New Mexico Counties: History and Information

Find a brief history of New Mexico CountiesBrief history of New Mexico Counties: Flags of Our Nation

There are 33 Counties in the state of New Mexico. The largest New Mexico county by size is Catron County, which is 6,928 square miles.

 There were originally nine counties formed in 1852. Santa Ana County, New Mexico Territory, one of the nine original counties, was annexed in 1876 to Bernalillo County, New Mexico.

The largest New Mexico county by population is Bernalillo County, which has a population of 556,678.

Find a brief history of New Mexico Counties
County 2000
Population
Square
Miles
County Seat Created
Bernalillo County 556,678 1,166 Albuquerque 1852
Catron County 3,543 6,928 Reserve 1921
Chaves County 61,382 6,071 Roswell 1889
Cibola County 25,595 4,540 Grants 1981
Colfax County 14,189 3,757 Raton 1869
Curry County 45,044 1,406 Clovis 1909
De Baca County 2,240 2,325 Fort Sumner 1917
Dona Ana County 174,682 3,807 Las Cruces 1852
Eddy County 51,658 4,182 Carlsbad 1887
Grant County 31,002 3,966 Silver City 1868
Guadalupe County 4,680 3,031 Santa Rosa 1891
Harding County 810 2,126 Mosquero 1921
Hidalgo County 5,932 3,446 Lordsburg 1920
Lea County 55,511 4,393 Lovington 1917
Lincoln County 19,411 4,831 Carrizozo 1869
Los Alamos County 18,343 109 Los Alamos 1949
Luna County 25,016 2,965 Deming 1901
McKinley County 74,798 5,449 Gallup 1899
Mora County 5,180 1,931 Mora 1859
Otero County 62,298 6,627 Alamogordo 1899
Quay County 10,155 2,875 Tucumcari 1903
Rio Arriba County 41,190 5,858 Tierra Amarilla 1852
Roosevelt County 18,018 2,449 Portales 1903
San Juan County 113,801 5,514 Aztec 1887
San Miguel County 30,126 4,717 Las Vegas 1852
Sandoval County 89,908 3,710 Bernalillo 1903
Santa Fe County 129,292 1,909 Santa Fe 1852
Sierra County 13,270 4,180 Truth Or Consequences 1884
Socorro County 18,078 6,647 Socorro 1852
Taos County 29,979 2,203 Taos 1852
Torrance County 16,911 3,345 Estancia 1903
Union County 4,174 3,830 Clayton 1903
Valencia County 66,152 1,068 Los Lunas 1852
County Resources
US Counties
Names given the counties, our most locally based jurisdictions, reflects the "characteristic features of this country!"
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