Select Page

History and Facts of New Mexico Counties

New Mexico Counties – New Mexico was organized as territory on September 9, 1850 and was admitted the union as the 47th state on Jan. 6, 1912. New Mexico has 33 Counties.

States bordering New Mexico are ArizonaColoradoOklahomaTexas and Utah.

In 1852 the first New Mexico counties were formed. The last county to be formed was Cibola County in 1981.

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.

List of New Mexico Counties

New Mexico is divided into 33 counties.

List of Old Former / Extinct New Mexico Counties

New Mexico has counties that no longer are in existence. A lot of these counties were established and disbanded within the 19th century; county borders have modified very little since 1900 in the vast most of states.

The below New Mexico counties no longer exist:

?? County, New Mexico

Created ? from ?. It was abolished ? and re-established as ? County on ?.

  • Santa Ana County [1852 Map]was one of the seven original partidos created in New Mexico under Mexican rule (was in Judicial District No. 1 from 1847 to 1863, then in JD 2 until 1876). Under U.S. rule, it became a U.S. Territorial county from 1852 until 1876, when it was absorbed by Bernalillo County.
  •  

Map of New Mexico County Boundary Changes from 1845 to 1981

This Interactive Map of New Mexico Counties show the historical boundaries, names, organization, and attachments of every county, extinct county and unsuccessful county proposal from the creation of New Mexico from 1845-1981.

Fun Facts about New Mexico Counties

County Name Facts

The County names:

  • 0 of them named for Native American words or people,
  •  

Counties by Year

In 1852 the first New Mexico counties were formed. The last county to be formed was Cibola County in 1981.

  • ? County was the first county created on ?.
  •  The last county to be formed was ? County on ?.
  •  

Facts for County Size

  • ? County (000 sq mi) is the largest county in New Mexico.
  • ? County (000 sq mi) is the smallest county in New Mexico.

Facts for County Population (2017 Est.)

  • ? County (000) is the most populated county in New Mexico.
  • ? County (000) is the least populated county in New Mexico.

Facts for New Mexico Counties and Cities

New Mexico’s 33 largest cities (2033) are:

  1. Birmingham (000) is in ? County and ? Counties
  2. New Mexico are Albuquerque, Las Cruces, Santa Fe, Rio Rancho, Roswell, Farmington, Clovis, Hobbs, Alamogordo and Carlsbad