Los Alamos County, New Mexico Genealogy

United States New Mexico  Los Alamos County



County Courthouse
Los Alamos County Courthouse PO Box 30 2300 Trinity Drive Los Alamos, NM 87544-3051 Phone: 505.662.8010 County Clerk has marriage records from 1940, land records from 1949, probate records from 1953, and burial records from 1961; District Court Clerk has divorce and court records.

Parent County

 * Up until 1821 - New Spain controlled land that later would become New Mexico and Arizona. Some records of early settlers may have been sent to an archives in Seville, Spain, or to archives in Mexico City.
 * From 1821 until 1846 - Mexico had jurisdiction over the land that later would become New Mexico and Arizona. Some records of this period may have been sent to archives in Mexico City. Starting in 1846 United States forces occupied New Mexico during the.
 * 1848 - Land that became Los Alamos County formally became a part of the United States when the Mexican-American War ended with ratification of the.


 * 1949--Los Alamos County was created 16 March 1949 from Sandoval and Santa Fe counties.

Neighboring Counties

 * Rio Arriba
 * Sandoval
 * Santa Fe

Family History Centers

 * Introduction to LDS Family History Centers
 * Los Alamos New Mexico Family History Center
 * Los Alamos, New Mexico
 * White Rock New Mexico Family History Center
 * Los Alamos, New Mexico

Web Sites

 * USGenWeb project. May have maps, name indexes, history or other information for this county. Select the state, then the county.