Jefferson County, Montana GenealogyEdit This Page

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United States Gotoarrow.png Montana Gotoarrow.png Jefferson County

Guide to Jefferson County Montana genealogy. Birth records, marriage records, death records, census records, family history, and military records.

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Online Records

Jefferson County, Montana
Map of the U.S. highlighting Montana
Location of Montana in the U.S.
Founded February 2, 1865
County Seat Boulder
Address Jefferson County Courthouse
201 Centennial
PO Box H
Boulder, MT 59632
Phone: 406.225.4020
Jefferson County Website


County Courthouse

County Clerk has birth and death records from 1907
and land records from 1865; Clerk District Court
has marriage, probate and court records [1]


Parent County

1865--Jefferson County was created 2 February 1865 as an original county.  County seat: Boulder [2]

Boundary Changes

Record Loss


Populated Places

Basin Cardwell Elkhorn Montana City
Boulder Clancy Jefferson City Whitehall

Neighboring Counties






Local Histories


  • See an interactive map of Jefferson County cemeteries and modern-day townships. (Histopolis)



  • Basin Progress - more than 200 issues spanning 1897-1904 freely available via Google News Archive
  • Basin Progress & Mining Review - more than 100 issues spanning 1905-1909 freely available via Google News Archive
  • Basin Republican Rustler - more than 100 issues spanning 2006-2009 freely available via Google News Archive
  • ($) has a collection of digitized Montana newspapers including Butte and Helena newspapers. This database is sometimes free at libraries.



Vital Records

For marriages from 1866-1900 see Western States Marriage Index.

Societies and Libraries

Family History Centers

Web Sites

  • USGenWeb project. May have maps, name indexes, history or other information for this county. Select the state, then the county.
  • Family History Library Catalog


  1. The Handybook for Genealogists : United States of America, 10th ed., (Draper, UT: Everton Publishers, 2002), p. 416.
  2. The Handybook for Genealogists: United States of America,10th ed. (Draper, UT:Everton Publishers, 2002).


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