<P> The Federal Information Processing Standard (FIPS) code, which is used by the United States government to uniquely identify states and counties, is provided with each entry . New Mexico's code is 35, which when combined with any county code would be written as 35XXX . The FIPS code for each county links to census data for that county . </P> <P> For comparison, the population estimate for the state of New Mexico as of July 2011 was 2,082,224, and the area was 7005121589000000000 ♠ 121,589 mi2 (315,194 km2). </P> <Table> <Tr> <Th> County </Th> <Th> FIPS code </Th> <Th> County seat </Th> <Th> Created </Th> <Th> Formed from </Th> <Th> Etymology </Th> <Th> Population </Th> <Th> Area </Th> <Th> Map </Th> </Tr> <Tr> <Td> Bernalillo County </Td> <Td> 001 </Td> <Td> Albuquerque </Td> <Td> 1852 </Td> <Td> One of the nine original counties . </Td> <Td> The Gonzales - Bernal family, Spanish nobles who settled the territory in the seventeenth century </Td> <Td> 7005670968000000000 ♠ 670,968 </Td> <Td> 7003116600000000000 ♠ 1,166 mi2 (3,020 km2) </Td> <Td> </Td> </Tr> <Tr> <Td> Catron County </Td> <Td> 003 </Td> <Td> Reserve </Td> <Td> 1921 </Td> <Td> Part of Socorro County . </Td> <Td> Thomas Benton Catron, a Santa Fe attorney and New Mexico's first U.S. Senator </Td> <Td> 7003373300000000000 ♠ 3,733 </Td> <Td> 7003692800000000000 ♠ 6,928 sq mi (7004179430000000000 ♠ 17,943 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Chaves County </Td> <Td> 005 </Td> <Td> Roswell </Td> <Td> 1889 </Td> <Td> Part of Lincoln County . </Td> <Td> Jose Francisco Chaves, a U.S. Army colonel in New Mexico during and after the Civil War </Td> <Td> 7004658900000000000 ♠ 65,890 </Td> <Td> 7003607100000000000 ♠ 6,071 sq mi (7004157240000000000 ♠ 15,724 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Cibola County </Td> <Td> 006 </Td> <Td> Grants </Td> <Td> 1981 </Td> <Td> Parts of Valencia County, Socorro County, McKinley County, and Catron County . </Td> <Td> The mythical Seven Cities of Cibola </Td> <Td> 7004276580000000000 ♠ 27,658 </Td> <Td> 7003454000000000000 ♠ 4,540 sq mi (7004117590000000000 ♠ 11,759 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Colfax County </Td> <Td> 007 </Td> <Td> Raton </Td> <Td> 1869 </Td> <Td> Part of Mora County . </Td> <Td> Schuyler Colfax, the seventeenth vice president of the United States </Td> <Td> 7004136400000000000 ♠ 13,640 </Td> <Td> 7003375700000000000 ♠ 3,757 sq mi (7003973100000000000 ♠ 9,731 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Curry County </Td> <Td> 009 </Td> <Td> Clovis </Td> <Td> 1909 </Td> <Td> Parts of Quay County and Roosevelt County . </Td> <Td> George Curry, a governor of New Mexico Territory from 1907 to 1910 </Td> <Td> 7004496490000000000 ♠ 49,649 </Td> <Td> 7003140600000000000 ♠ 1,406 sq mi (7003364200000000000 ♠ 3,642 km) </Td> <Td> </Td> </Tr> <Tr> <Td> De Baca County </Td> <Td> 011 </Td> <Td> Fort Sumner </Td> <Td> 1917 </Td> <Td> Parts of Chaves County and Guadalupe County . </Td> <Td> Ezequiel Cabeza de Baca, the second state governor of New Mexico </Td> <Td> 7003194500000000000 ♠ 1,945 </Td> <Td> 7003232500000000000 ♠ 2,325 sq mi (7003602200000000000 ♠ 6,022 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Doña Ana County </Td> <Td> 013 </Td> <Td> Las Cruces </Td> <Td> 1852 </Td> <Td> One of the nine original counties . </Td> <Td> Doña Ana Robledo, a seventeenth - century Spanish woman known for her charitable giving to the native population </Td> <Td> 7005213598000000000 ♠ 213,598 </Td> <Td> 7003380700000000000 ♠ 3,807 sq mi (7003986000000000000 ♠ 9,860 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Eddy County </Td> <Td> 015 </Td> <Td> Carlsbad </Td> <Td> 1887 </Td> <Td> Part of Lincoln County . </Td> <Td> Charles Eddy, a rancher and developer of the area </Td> <Td> 7004541520000000000 ♠ 54,152 </Td> <Td> 7003418200000000000 ♠ 4,182 sq mi (7004108310000000000 ♠ 10,831 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Grant County </Td> <Td> 017 </Td> <Td> Silver City </Td> <Td> 1868 </Td> <Td> Part of Doña Ana County . </Td> <Td> Ulysses Simpson Grant, the Civil War general and eighteenth president of the United States </Td> <Td> 7004293800000000000 ♠ 29,380 </Td> <Td> 7003396600000000000 ♠ 3,966 sq mi (7004102720000000000 ♠ 10,272 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Guadalupe County </Td> <Td> 019 </Td> <Td> Santa Rosa </Td> <Td> 1891 </Td> <Td> Part of San Miguel County . </Td> <Td> Our Lady of Guadalupe, the patron saint of the Americas </Td> <Td> 7003461900000000000 ♠ 4,619 </Td> <Td> 7003303100000000000 ♠ 3,031 sq mi (7003785000000000000 ♠ 7,850 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Harding County </Td> <Td> 021 </Td> <Td> Mosquero </Td> <Td> 1921 </Td> <Td> Parts of Mora County and Union County . </Td> <Td> Warren Gamaliel Harding, the twenty - ninth president of the United States </Td> <Td> 7002740000000000000 ♠ 740 </Td> <Td> 7003212600000000000 ♠ 2,126 sq mi (7003550600000000000 ♠ 5,506 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Hidalgo County </Td> <Td> 023 </Td> <Td> Lordsburg </Td> <Td> 1920 </Td> <Td> Part of Grant County . </Td> <Td> Miguel Hidalgo y Costilla, the priest who is known as the Father of Mexican Independence </Td> <Td> 7003486100000000000 ♠ 4,861 </Td> <Td> 7003344600000000000 ♠ 3,446 sq mi (7003892500000000000 ♠ 8,925 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Lea County </Td> <Td> 025 </Td> <Td> Lovington </Td> <Td> 1917 </Td> <Td> Parts of Chaves County and Eddy County . </Td> <Td> Joseph Calloway Lea, a captain in the U.S. Army and the founder of the New Mexico Military Academy </Td> <Td> 7004654230000000000 ♠ 65,423 </Td> <Td> 7003439300000000000 ♠ 4,393 sq mi (7004113780000000000 ♠ 11,378 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Lincoln County </Td> <Td> 027 </Td> <Td> Carrizozo </Td> <Td> 1869 </Td> <Td> Part of Socorro County . </Td> <Td> Abraham Lincoln, the sixteenth president of the United States </Td> <Td> 7004204540000000000 ♠ 20,454 </Td> <Td> 7003483100000000000 ♠ 4,831 sq mi (7004125120000000000 ♠ 12,512 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Los Alamos County </Td> <Td> 028 </Td> <Td> Los Alamos </Td> <Td> 1949 </Td> <Td> Parts of Sandoval County and Santa Fe County . </Td> <Td> Named for its county seat of Los Alamos, New Mexico, which itself is the Spanish name for the cottonwood tree </Td> <Td> 7004182220000000000 ♠ 18,222 </Td> <Td> 7002109000000000000 ♠ 109 sq mi (7002282000000000000 ♠ 282 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Luna County </Td> <Td> 029 </Td> <Td> Deming </Td> <Td> 1901 </Td> <Td> Parts of Doña Ana County and Grant County . </Td> <Td> Solomon Luna, the largest land owner in the county at the time of its creation; itself Spanish for moon </Td> <Td> 7004252810000000000 ♠ 25,281 </Td> <Td> 7003296500000000000 ♠ 2,965 sq mi (7003767900000000000 ♠ 7,679 km) </Td> <Td> </Td> </Tr> <Tr> <Td> McKinley County </Td> <Td> 031 </Td> <Td> Gallup </Td> <Td> 1899 </Td> <Td> Part of Bernalillo County . </Td> <Td> William McKinley, the twenty - fifth president of the United States </Td> <Td> 7004736640000000000 ♠ 73,664 </Td> <Td> 7003544900000000000 ♠ 5,449 sq mi (7004141130000000000 ♠ 14,113 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Mora County </Td> <Td> 033 </Td> <Td> Mora </Td> <Td> 1859 </Td> <Td> Part of Taos County . </Td> <Td> Named for its county seat of Mora, New Mexico, which is itself named after lo de mora, the Spanish term for blackberry </Td> <Td> 7003477300000000000 ♠ 4,773 </Td> <Td> 7003193100000000000 ♠ 1,931 sq mi (7003500100000000000 ♠ 5,001 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Otero County </Td> <Td> 035 </Td> <Td> Alamogordo </Td> <Td> 1899 </Td> <Td> Parts of Doña Ana County and Lincoln County . </Td> <Td> Miguel A. Otero, territorial delegate to U.S. Congress </Td> <Td> 7004657030000000000 ♠ 65,703 </Td> <Td> 7003662700000000000 ♠ 6,627 sq mi (7004171640000000000 ♠ 17,164 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Quay County </Td> <Td> 037 </Td> <Td> Tucumcari </Td> <Td> 1903 </Td> <Td> Part of Guadalupe County . </Td> <Td> Matthew Stanley Quay, a U.S. Senator from Pennsylvania who supported New Mexico's statehood </Td> <Td> 7003902600000000000 ♠ 9,026 </Td> <Td> 7003285500000000000 ♠ 2,855 sq mi (7003739400000000000 ♠ 7,394 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Rio Arriba County </Td> <Td> 039 </Td> <Td> Tierra Amarilla </Td> <Td> 1852 </Td> <Td> One of the nine original counties . </Td> <Td> Named for its location on the upper Rio Grande (Río Arriba means "upstream" or "up the river" in Spanish) </Td> <Td> 7004404460000000000 ♠ 40,446 </Td> <Td> 7003585800000000000 ♠ 5,858 sq mi (7004151720000000000 ♠ 15,172 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Roosevelt County </Td> <Td> 041 </Td> <Td> Portales </Td> <Td> 1903 </Td> <Td> Parts of Chaves County and Guadalupe County . </Td> <Td> Theodore Roosevelt, the twenty - sixth president of the United States </Td> <Td> 7004204460000000000 ♠ 20,446 </Td> <Td> 7003244900000000000 ♠ 2,449 sq mi (7003634300000000000 ♠ 6,343 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Sandoval County </Td> <Td> 043 </Td> <Td> Bernalillo </Td> <Td> 1903 </Td> <Td> Part of Bernalillo County . </Td> <Td> Named for the Sandoval family, prominent seventeenth - century Spanish landowners </Td> <Td> 7005134259000000000 ♠ 134,259 </Td> <Td> 7003371000000000000 ♠ 3,710 sq mi (7003960900000000000 ♠ 9,609 km) </Td> <Td> </Td> </Tr> <Tr> <Td> San Juan County </Td> <Td> 045 </Td> <Td> Aztec </Td> <Td> 1887 </Td> <Td> Part of Rio Arriba County . </Td> <Td> San Juan River, itself named after the Catholic saint </Td> <Td> 7005128200000000000 ♠ 128,200 </Td> <Td> 7003551400000000000 ♠ 5,514 sq mi (7004142810000000000 ♠ 14,281 km) </Td> <Td> </Td> </Tr> <Tr> <Td> San Miguel County </Td> <Td> 047 </Td> <Td> Las Vegas </Td> <Td> 1852 </Td> <Td> One of the nine original counties . </Td> <Td> San Miguel de Bado Catholic Church, the first in the area </Td> <Td> 7004293010000000000 ♠ 29,301 </Td> <Td> 7003471700000000000 ♠ 4,717 sq mi (7004122170000000000 ♠ 12,217 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Santa Fe County </Td> <Td> 049 </Td> <Td> Santa Fe </Td> <Td> 1852 </Td> <Td> One of the nine original counties . </Td> <Td> Spanish term meaning "holy faith," which refers to the spirituality of the founding missionaries </Td> <Td> 7005145648000000000 ♠ 145,648 </Td> <Td> 7003190900000000000 ♠ 1,909 sq mi (7003494400000000000 ♠ 4,944 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Sierra County </Td> <Td> 051 </Td> <Td> Truth or Consequences </Td> <Td> 1884 </Td> <Td> Parts of Doña Ana County and Socorro County . </Td> <Td> Possibly named for the Black Range . (Sierra is mountain range in Spanish .) </Td> <Td> 7004119430000000000 ♠ 11,943 </Td> <Td> 7003418000000000000 ♠ 4,180 sq mi (7004108260000000000 ♠ 10,826 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Socorro County </Td> <Td> 053 </Td> <Td> Socorro </Td> <Td> 1852 </Td> <Td> One of the nine original counties . </Td> <Td> Spanish term meaning "aid," which refers to the help Native Americans gave to starving travelers </Td> <Td> 7004178730000000000 ♠ 17,873 </Td> <Td> 7003664700000000000 ♠ 6,647 sq mi (7004172160000000000 ♠ 17,216 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Taos County </Td> <Td> 055 </Td> <Td> Taos </Td> <Td> 1852 </Td> <Td> One of the nine original counties . </Td> <Td> Named for its county seat of Taos, New Mexico, which in turn was named for the nearby Taos Pueblo, an ancient Native American village . Taos is red willow in the Tiwa language </Td> <Td> 7004329170000000000 ♠ 32,917 </Td> <Td> 7003220300000000000 ♠ 2,203 sq mi (7003570600000000000 ♠ 5,706 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Torrance County </Td> <Td> 057 </Td> <Td> Estancia </Td> <Td> 1903 </Td> <Td> Parts of Bernalillo County, Valencia County, and Socorro County . </Td> <Td> Francis J. Torrance, the developer of the New Mexico Central Railroad </Td> <Td> 7004163450000000000 ♠ 16,345 </Td> <Td> 7003334500000000000 ♠ 3,345 sq mi (7003866400000000000 ♠ 8,664 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Union County </Td> <Td> 059 </Td> <Td> Clayton </Td> <Td> 1893 </Td> <Td> Parts of Colfax County, Mora County and San Miguel County . </Td> <Td> Named for the "union" of the three counties which donated land to form the new county </Td> <Td> 7003443300000000000 ♠ 4,433 </Td> <Td> 7003383000000000000 ♠ 3,830 sq mi (7003992000000000000 ♠ 9,920 km) </Td> <Td> </Td> </Tr> <Tr> <Td> Valencia County </Td> <Td> 061 </Td> <Td> Los Lunas </Td> <Td> 1852 </Td> <Td> One of the nine original counties . </Td> <Td> Named for the town of Valencia, New Mexico, which is itself named for Valencia, Spain </Td> <Td> 7004770700000000000 ♠ 77,070 </Td> <Td> 7003106800000000000 ♠ 1,068 sq mi (7003276600000000000 ♠ 2,766 km) </Td> <Td> </Td> </Tr> </Table> <Tr> <Th> County </Th> <Th> FIPS code </Th> <Th> County seat </Th> <Th> Created </Th> <Th> Formed from </Th> <Th> Etymology </Th> <Th> Population </Th> <Th> Area </Th> <Th> Map </Th> </Tr>

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