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Los Alamos County, New Mexico

Los Alamos County was founded on March 16, 1949 from Sandoval County and Santa Fe County.

The Los Alamos County Seat is situated in Los Alamos and the county government website is

Locations bordering Los Alamos County are Rio Arriba CountySanta Fe CountySandoval County.

You’ll find free online and printable census forms to aid with your research.

Los Alamos County Society and Family History Resources

A list of Los Alamos County Historical  and Genealogical Societies, Forums, Message Boards, Libraries, Archives.

Los Alamos County Courthouse and Government Records

Researchers often forget the significance of Los Alamos County court, probate, and land files as a useful resource of ancestry and genealogy details. Buried away in New Mexico courthouses and archives everywhere tend to be the desires and worries of many New Mexico inhabitants.

The chances are excellent that your particular ancestors and forefathers have left a in-depth record of at least quite a few aspects of their lives in the Los Alamos County court records. Even if your forefathers is not brought up in a Court case, give some thought to all of the other methods which often can have lead to him or her showing up in court records.

The below details indicates what birth, death, marriage, land, wills, and legal records are in Los Alamos County. The years New Mexicod listed below could be the first recognized documents for this county.

  • Los Alamos County Courthouse (all departments listed below are located here, unless otherwise noted)
    • Address: 475 20th St, Los Alamos, NM 87544
    • Phone: (505) 662-8010
  • Los Alamos County Clerks office
    • Marriage Records: 1949
    • Land Records: 1949
    • Probate Records: 1950
  • Los Alamos County 1st District Court Clerk
    • Address: 2500 Trinity Drive, Los Alamos, NM 87544
    • Phone:505-455-8250

Los Alamos County Links

The following are web links to Family history and genealogy, Records and Resources relating to Los Alamos County. A lot of these genealogy links fall into 3 categories: Business Sites, Personal Sites or Organization Sites. Some have free access some call for a payment. This is just a directory that has been gathered or submitted. I do not endorse or promote one genealogy site above another. Feel free to suggest your own preferred Los Alamos County genealogy or family history affiliated sites.

Los Alamos Co. NM Books, Newspapers & Publications

Los Alamos Co. NM Birth, Marriage & Death Records

Los Alamos Co. NM Court, Probate Land and Tax Records

Los Alamos Co. NM Census Records

Los Alamos Co. NM Cemeteries & Church Records

Los Alamos Co. NM Family Websites, Pictures & Histories

Los Alamos Co. NM General and History Websites

Los Alamos Co. NM Maps, Atlases & Gazetteers

Los Alamos Co. NM Military Records

Los Alamos Co. NM Schools & Directories