The Denver Sheriff Department was created on December 2, 1902 with the creation of the City and County of Denver. On January 1, 1904, Article XX (the Rush Amendment) of the Colorado Constitution establishing a home rule form of government in Denver was found constitutional and the boundaries of the City of Denver became the same as that of the County of Denver.
Due to this action, there was no need for two law enforcement bodies within the same jurisdiction. Since the Denver Police Department was already performing the patrol duties in the city it was decided that the Denver Sheriff Department would only perform the duties as defined by state law; meaning the Denver Deputy Sheriffs would be assigned to the courts and jails. This remains the primary function of the Department today.
The City and County of Denver does not have an elected sheriff, the Manager of Safety is the de-facto sheriff and the department is directly supervised by the Director of Corrections, who is also the Undersheriff.