Boulder County, Colorado Genealogy

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Guide to  Boulder County, Colorado genealogy. Birth records, marriage records, death records, census records, family history, and military records.

South Boulder Creek, Boulder County


Boulder County, Colorado
Map of Colorado highlighting Boulder County
Location in the state of Colorado
Map of the U.S. highlighting Colorado
Location of Colorado in the U.S.
Founded November 1, 1861
County Seat Boulder
Address Boulder County Courthouse
2020 13th st
PO Box 471
Boulder, CO 80302
Phone 303.441.7770
Boulder County Website

County Courthouse

County recorder has marriage records from 1863, land records from 1864 and military discharge records from 1917; County Health Department has birth and death records records from 1872. County Court has probate, divorce and court records.[1]

Boulder Clerk Recorder's Office
1750 33rd Street, Suite 201
Boulder, CO 80301            (303) 413-7770

Historical Facts

Boulder County, Colorado was organized when the Colorado territory was formed. Prior to that, the area was Jackson county in the unrecognized territory of Jefferson that existed from October 24, 1859 until the creation of the Colorado Territory on February 28, 1861 The early settlers mostly came for the Colorado gold rush in 1858.

Local History and Biographies:
Local histories are available for Boulder County, Colorado Genealogy. County histories may include biographies, church, school and government history, and military information. For more information about local histories, see the wiki page section Colorado Local Histories.

Some local histories available are these:

Boulder County: an illustrated history / by Thomas J. Noel and Dan W. Corson.
Carlsbad, Calif. ; Heritage Media Corp., c1999.

Ghosts of Boulder County : a guide to the ghost towns and mining camps of Boulder County, Colorado / written and photographed by John K. Aldrich. Lakewood, Colo. (5815 W. 6th St., Bldg. 2, Suite. A, Lakewood 80214) : Centennial Graphics, c1986

A guide to the greater St. Vrain Valley.
Compass Communications, 1975-

Boulder County (Colorado) area key : a study of the genealogical record sources of Boulder County, Colorado, including maps, history, addresses / compiled by Florence Runyan Clint.
Denver, CO : Eden Press, c1969.

The Colorado State Archives has the following records available for Boulder County, Colorado Genealogy in this online database Archives Search. For a full list of online holdings, click here.
1880-1939 Divorce Index
1883-1900 Mine Accidents, Non - fatal
1897-1920 Horseshoers
1936-1942 Civilian Conservation Corps Enrollments
1966-1968 Vietnam Deaths

1862-1900 Boulder County Probates
1871-1872 Boulder County Rights of Way Cases
1892-1906 Boulder County Birth Index
1904-1918 Boulder County Divorce
1914-1934 Boulder County Mothers Compensations
1933-1936 Boulder County Old Age Pension
1941-1943 Boulder County Inheritance Tax Records

Parent County

1861 November 1: Boulder County was created 1 November 1861 as an original county.
County seat: Boulder

Neighboring Counties


Places / Localities

Populated Places

Populated Places in Boulder County
Erie *
Coal Creek **
Eldora Springs

Superior ***
Gold Hill

Gunbarrel #

Hygiene # #

Niwot # #

Valmont #

* partly in Weld County
** partly in Gilpin County and Jefferson County
*** partly in Jefferson County
# also check for records in Boulder
# # also check for records in Longmont

Unpopulated Places

Caribou, Colorado was an important silver mining town. Famed at the time for being the coldest, snowiest, windiest town, at 10,000 feet elevation it was not an easy place to live. The Silver Crash of 1893 meant that it was less profitable. Incorporated as a town in 1871, Caribou had peak population of 549 in the 1880 census, and became a ghost town by the 1920s. [2]

Many mining communities have formed and disbanded in this area, including Wall Street, Tungsten, Summerville, Rowena, Marshall and Magnolia. [3]

Record Loss

There is no known history of courthouse disasters in this county.



Tombstone Transcriptions Online Tombstone Transcriptions in Print List of Cemeteries in the county Family History Library
COGenWeb WorldCat Billion Graves
COGenWeb Archives
Tombstone Project
Colorado Gravestones
Billion Graves
See Colorado Cemeteries for more information.


  • 1860 The first U.S. federal census that included the Boulder county area was part of the 1860 Nebraska territorial census. Transcribed records from that census are available here:
  • 1870 U. S. federal census records began for Colorado in 1870 and continue every ten years to the present.
  • 1860-1940 Colorado Census Records from 1860 to 1940 at — index/images

For tips on accessing Boulder County, Colorado Genealogy census records online, see: Colorado Census.

Church Records

Church records vary significantly depending on the denomination and the record keeper. They may contain information about members of the congregation, such as age, date of baptism, christening, or birth; marriage information and maiden names; and death date. For general information about Colorado denominations, view the Colorado Church Records wiki page. See also

Longmont Churches Lafayette Churches Louisville Churches


  • Records of the American Lutheran Church, Broomfield, in Evangelical Lutheran Church in America database at ($).

Court Records

Numerous records are available at Colorado Archives. To use this link scroll down the page to where it asks for Record Type. Click there and scroll down the list to the records you want and select. The next field asks for county. Select the county you want and then click on Search. You can narrow the search by adding the additional information it asks for.

1914-1934 Boulder County Mothers' Compensation Records 1914-1934. An Index compiled from the official]] record of the applications granted by the Boulder County Commissioners during these years. Record may show the following:

  • Name of Applicant
  • Date and Amount of Compensation payment
  • Any adjustments to the pension
  • Person's age
  • Town nearest to where they lived
  • Other Actions done by the County.

1933-1936 Boulder County Old Age Pension Records 1933-1936. An Index compiled from the official record of the applications granted by the Boulder County Commissioners during these years. Record may show the following:

  • Name of Applicant
  • Date and Amount of pension payment
  • Any adjustments to the pension
  • Person's age
  • Town nearest to where they lived
  • Other Actions done by the County

Land and Property

Land and property records can place an ancestor in a particular location, provide economic information, and reveal family relationships. Land records include: deeds, abstracts and indexes, mortgages, leases, grants and land patents.

See Colorado Land and Property for additional information about early Colorado land grants.

After land was transferred to private ownership, subsequent transactions were usually recorded at the county courthouse, where current records are also housed.

Boulder County Recording Division (303) 413-7770 and fax (303) 413-7775


Boulder County has numerous maps available online here: Maps



Microfilm of old newspapers is available at the Boulder Public Library and at the Longmont Public Library. The Longmont collection includes issues from 1872 to the present. See Longmont Newspapers

Online Newspapers

Additional newspapers abstracts can sometimes be found using search phrases such as Boulder County, Colorado Genealogy newspapers in online catalogs like:


Probate Records

Probate records have been kept by the county courts. Colorado probate records include bonds, affidavits, letters, claims, appraisals, fee accounts, minutes, judgments, dockets, calendars, case files, and wills. The Family History Library does not have copies of probate records from Colorado.

You may obtain copies of documents from the clerk's office in the county courthouse.

Online Records

  • 1852 to 2004 The probate holdings in the state archives for Boulder County include the years 1852 to 2004.
  • 1862-1900 The Colorado State Archives has a searchable database for county probate records. Boulder County records for the years 1862 to 1900 can be found in this index. Boulder County Records.
  • 1875–1974 Colorado Wills and Probate Records 1875-1974 at — index and images $

Societies and Libraries


Boulder Genealogical Society
P.O. Box 3246
Boulder, CO 80307-3246

Longmont Genealogical Society
P.O. Box 6081
Longmont, CO 80501-2077

St. Vrain Historical Society
P.O. Box 705
Longmont, Colorado 80502-0705
Telephone Number: 303-776-1870

Broomfield Genealogy Society
Broomfield, CO



Family History Centers

Family History Centers provide one-on-one assistance and free access to premium genealogical websites. In addition, many centers have free how-to genealogy classes. See Family History Center for more information. Search the online FHC directory for a nearby family history center.


Colorado tax records complement land records and can be used as supplements to censuses. There may be gaps of several years in the records. To find tax records in the FamilySearch Catalog, do a Place Search for the county.

1941-1943 Boulder County Inheritance Tax Records Index (1941-1943) is one of many On-Line Indexes available at the Colorado State Archives website.

Vital Records

Vital Records consist of births, adoptions, marriages, divorces, and deaths recorded on registers, certificates, and documents. A copy or an extract of most original records can be purchased from the Vital Records Section Colorado Department of Public Health and Environment or the County Clerk's office of the county where the event occurred.

For some online statewide indexes, see the FamilySearch Historical Record Collections for Colorado.

Beginning dates for major county records
1866 - 1909 *
1863 *
1880 - 1903*
1864 **

*For earlier dates, try... Church | Obituaries | Cemeteries

    • Estate Files from 1862 are in the Colorado State Archives

See also Colorado Vital Records.


Birth records may become public records when 100 years have elapsed after the date of birth. EXCEPTION: The birth record of any individual who is known to be currently alive will remain confidential even if they are 100 years of age or greater. [5]

Boulder County Public Health can issue certified birth certificates for births occurring anywhere in Colorado from 1904 to present day. They only issue certified copies of birth certificates.

Only the person named on the record or members of the immediate family, legal representatives of those named above, or others demonstrating a direct and tangible interest in the record may request a copy if the birth occurred within the last 100 years as stated above. Proof of your relationship or direct and tangible interest is required.

Birth & Death Certificates

Boulder: (303) 441-1100
Longmont: (303) 678-6166


The Boulder County Recorder's office will search their indexes if you call or come in to the office. If a record is found, a copy can be purchased in person or by mail. Call (303) 413-7770 and press 0 to speak to a clerk.


Death records may become public records when 75 years have elapsed after the date of death. [5]

Certified copies of death certificates may be issued to: parents; grandparents; stepparents; siblings; spouse; adult children, stepchildren, or grandchildren of the deceased; legal representatives of any of the above; legal representatives of the deceased; probate researchers; genealogists representing family members with appropriate credentials; others who may demonstrate a direct and tangible interest when information is needed for determination or protection of a personal property right. Proof of your relationship or direct and tangible interest is required.


Boulder County divorces take place in Colorado’s 20th Judicial District. To obtain copies of divorce records there are fees for searching and for copies.

Boulder County Combined Courts Research Department (303) 441-4860 Combined Courts Research Department

1904-1912 The Colorado State Archives has put a name only index to the Boulder County Divorce Records for the period 5/14/1904 to 4/22/1912 on-line.

1964-1995 The Colorado State Archives also has the divorce records for Boulder County from 1964 to 1995. To obtain these records, you need the case number and can get it from the Boulder County Combined Courts. Then go to Combined Courts Divorce Records



  1. Handybook for Genealogists: United States of America, 10th ed. (Draper, Utah: Everton Pub., 2002), Boulder County, Colorado. Page 97At various libraries (WorldCat); FHL Book 973 D27e 2002.
  2. Noel, Thomas J. and Dan W. Corson. Boulder County, An Illustrated History.; Carlsbad, California; Heritage Media Corporation: 1999. pp 63-65.
  3. Bright, William. Colorado Place Names;. Boulder, Colorado; Johnson Printing Company: 2004, 1993.
  4. 4.00 4.01 4.02 4.03 4.04 4.05 4.06 4.07 4.08 4.09 4.10 4.11 Colorado Online Historical Newspapers,, accessed 19 July 2013.
  5. 5.0 5.1 Letter from Colorado State Registrar, Dated September 1, 2011. Policy Number 2011- 08.