The City of Glendale is a home rule municipality located in an exclave of Arapahoe County, Colorado, United States. The city population was 4,613 at the 2020 United States Census. Glendale is an enclave of the City and County of Denver and is the most densely populated municipality in Colorado. The city is a part of the Denver–Aurora–Lakewood, CO Metropolitan Statistical Area and the Front Range Urban Corridor.

Arapahoe County is a county located in the U.S. state of Colorado. As of the 2020 census, its population was 655,070, making it the third-most populous county in Colorado. The county seat is Littleton, and the most populous city is Aurora. The county was named for the Arapaho Native American tribe, who once lived in the region.