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Boulder County, Colorado
Genealogy, History & Facts

Boulder County, Colorado Facts

When was Boulder County, CO Created?
Boulder County was established on November 1, 1861.

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 CountyWeld CountyCity and County of BroomfieldJefferson CountyGilpin County Grand County.

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 CertificateMarriage VerificationDivorce VerificationDeath 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 18701880 (free index)1890 (fragment)19001910192019301940.

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?

Researchers frequently overlook the great importance of Boulder County court, probate, and land records data as a useful resource of ancestry and genealogy information. Buried away in Colorado courthouses and archives everywhere are the ambitions and frustrations of countless Colorado residents.

The possibilities are excellent that your forefathers have left a comprehensive document of at least a number of facets of their lives in the Boulder County court records. Even if your forebears is not referred to in a Court case, contemplate all of the other procedures that could have lead to him or her to appear in court records. 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
    • 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