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Introduction to Vital Records
Vital Records consist of births, adoptions, marriages, divorces, and deaths recorded on registers, certificates, and documents. United States Vital Records has additional research guidance on researching and using vital records. A copy or an extract of most original records can be purchased from the Colorado Vital Records State Department of Health or the County Clerk's office of the county where the event occurred. See also Colorado Statewide Indexes and Collections at the Family History Library.
Colorado Birth, Marriage and Death Records Online
The following is a list of online resources useful for locating Colorado Vital Records which consist of births, adoptions, marriages, divorces, and deaths. Most online resources for Colorado Vital Records are indexes. After locating a person in an index always consult the original record to confirm the information in the index.
Births and Deaths
Early - 1907
A law was passed in 1876 requiring counties and towns in Colorado to record births and deaths. In those counties where the clerks complied, the records are available at the local courthouse. Most early files are incomplete.
1907 - Present
Statewide registration began in 1907 and was generally complied with by 1920. Some of the earlier county records and delayed registrations of births since 1941 are at the Colorado Department of Health. To obtain copies of these records, write to:
Vital Records Section
The current fees for records are at the above website and at VitalRecords.com. State your relationship to the individual you want information about and your reason. Certificates are released only to members of the immediate family.
open / closed / state statutes
Each county has kept marriage records since the date it was organized. A few records date from 1860. You can write to the appropriate county clerk for information.
The Colorado Department of Health has a statewide index to marriages from 1900 to 1939 and from 1975 to the present. They will check the index and then forward the inquiry to the correct county office.
The Colorado Division of State Archives and Public Records also has copies of marriage records for 20 counties, including Denver from 1861 to 1952.
Some county marriage records have been extracted and published. For example, many early marriage records have been published in The Colorado Genealogist see the Periodicals page. The earliest Denver and Arapahoe County marriage records have recently been published in Marriages of Arapahoe County, Colorado, 1859-1901: Including "Territory That Became Adams, Denver, and Other Counties" 
Many of the early marriages for the western part of the state are searchable online at no cost in the Western States Marriage Index.
Divorce records are available from the clerk of the district court in the county where the decree was granted. The Colorado Department of Health has a statewide index of divorce records for the years 1900 to 1939 and 1968 to the present. The index identifies the county that granted the divorce. The department of health does not provide certified copies. You can write to the county clerk for copies of the records.
Early to 1900
1900 - Present
Learn more about the history and availability of vital records in Guide to Vital Statistics Records in Colorado, Volume 1 
Archives, Libraries and Societies