Search For Your Ancestors in Historical Documents




Boulder County, Colorado
Genealogy, History & Facts

Boulder County, Colorado Facts

Boulder County

When was Boulder County, CO Created?
Boulder County was established on November 1, 1861 as one of the 17 original counties of the Territory of Colorado. The county was named for the abundance of granite boulders along Boulder Creek.

What is the County Seat of Boulder County, CO?
The County Seat is located in Boulder and the county government website is

What counties are adjacent to Boulder County, CO?
Bordering Counties are Larimer County (north), Weld County (east), City and County of Broomfield (south), Jefferson County (south), Gilpin County (south), Grand County (west).

What cities and towns are in Boulder County, CO?
Cities and towns located in the County include City of Boulder, Erie, Jamestown, Lafayette, Longmont, Louisville, Lyons, Nederland, Superior, Ward

Boulder County, CO Vital Records

Where can find Boulder County Birth, marriage, Divorce and Death Records?
Boulder County vital records can be found at the Colorado Office of Vital Records which has copies of birth, marriage, divorce and death records. There is a fee for each copy requested. Please refer to the information to the Statewide Vital Records in Colorado for current fees and application process.

You can search online for Boulder County Birth, Marriage, Divorce or Death Records. You can also Order Electronically Online or can download an application for Colorado Birth Certificate, Marriage Verification, Divorce Verification, Death Certificate Applications to mail.

Boulder County, CO Census Records

What Boulder County, CO census records are available?
There are many types of census records for Boulder County guide you in researching your family tree. Federal Population Schedules are available for 1870, 1880 (free index), 1890 (fragment), 1900, 1910, 1920, 1930, 1940.

Boulder Co. Mortality Schedules can be acquired for 1870 and 1880. Boulder Co. Industry and Agriculture Schedules is available for 1870 and 1880. Boulder Co. Union Veterans Schedules can be acquired for 1890. There are free online and printable census forms to aid with your research.

Boulder County, CO Societies and Family History Resources

What genealogical and historical societies, archives, museums, associations and libraries are available for Boulder County, CO?
A list of Boulder County Historical  and Genealogical Societies, Libraries, Archives. See also list of Statewide Colorado Archives, Historical & Genealogical Societies.

Boulder County, CO Courthouse and Government Records

Boulder County Courthouse

What genealogical records can I find in the Boulder County Courthouse?
The below facts shows exactly what death, marriage, birth, property, wills, and court records are typically in Boulder County. The years listed below are the first noted records with this county. See Also Colorado Corthouse Records Research Guide.

Boulder was called Jackson County when it was part of Jefferson Territory.
  • Boulder County Courthouse (all departments listed below are located here, unless otherwise noted)
    • Address: 2020 13th st; PO Box 471, Boulder, CO 80302
    • Phone:303.441.7770 
  • Boulder County Clerk & Recorder is responsible for recording deeds, marriage licenses, issuing passports, titling and registering automobiles, issuing driver's licenses, registering voters, administering elections and maintaining records for the Board of County Commissioners.
    • Marriage Records: 1864
    • Land Records: 1864
  • Boulder County Clerk of Courts
    • Probate Records: 1864 ;  Estate files from 1862 are housed at the Colorado State Archives.
    • Court Records: 1864 
  • Boulder County Public Health
    • Birth / Death Records: 1880–1909 / 1880–1903 ; City Hall in Boulder.

Where can I connect with other Boulder County, CO Researchers through message boards and forums?

What other genealogical resources are available in Boulder County, CO?
The following are web links to Genealogy, Records and Resources pertaining to Boulder County.

Boulder Co. CO Books, Newspapers & Publications

Boulder Co. CO Birth, Marriage & Death Records

Boulder Co. CO Court, Probate Land and Tax Records

Boulder Co. CO Census Records

Boulder Co. CO Cemeteries & Church Records

Boulder Co. CO Family Websites, Pictures & Histories

Boulder Co. CO General and History Websites

Boulder Co. CO Maps, Atlases & Gazetteers

Boulder Co. CO Military Records

Boulder Co. CO Schools & Directories

Copyright © 2014,