Holly Hills is an unincorporated community and a census-designated place (CDP) located in and governed by Arapahoe County, Colorado, United States.

Holly Hills is an enclave of the City and County of Denver.

The population of the Holly Hills CDP was 2,683 at the United States Census 2020.

[4] The Holly Hills CDP has an area of 371 acres (1.503 km2), all land.

[1] The United States Census Bureau initially defined the Holly Hills CDP for the United States Census 2010.