Denver
The Colorado Territory was created on February 28, 1861, Arapahoe County was formed on November 1, 1861, and Denver City was incorporated on November 7, 1861. Denver City served as the Arapahoe County Seat from 1861 until consolidation in 1902. In 1867, Denver City became the Territorial Capital. With its new-found importance, Denver City shortened its name to just Denver. On August 1, 1876, Colorado was admitted to the Union.