List of counties in New Mexico
This is a list of the 33 counties in 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.
The Federal Information Processing Standard 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.
List
For comparison, the population estimate for the state of New Mexico as of July 2011 was 2,082,224, and the area was mi².
| County | FIPS code
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| Formed from
| Etymology
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| Area
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Former counties
- Arizona County, New Mexico Territory, is mentioned in the 1860 United States Census.
- Mesilla County, appears on 1860s-era territorial map encompassing area in present-day Dona Aña, Grant, Hidalgo, Luna, Sierra west of the Rio Grande
- Santa Ana County absorbed by Bernalillo County; portions are in present-day McKinley County
- Santa Fe County, Texas, never organized, included the portion of New Mexico east of the Rio Grande except for southeastern New Mexico east of the Pecos River and south of the Prairie Dog Town Fork Red River as well as the Trans-Pecos and most of the Panhandle regions of Texas, the Oklahoma Panhandle, and portions of Colorado, Kansas, and Wyoming. Before Texas ceded its western lands to the federal government after the Compromise of 1850, the following counties were briefly created from Santa Fe County earlier that year in south-central New Mexico between the Rio Grande and the Pecos:
- * El Paso County, Texas
- * Worth County, Texas
