Pine Brook Hill is an unincorporated community and a census-designated place (CDP) located in and governed by Boulder County, Colorado, United States.

The CDP is a part of the Boulder, CO Metropolitan Statistical Area.

The population of the Pine Brook Hill CDP was 975 at the United States Census 2020.

[3] The Boulder post office (Zip Code 80304) serves the area.

It is located in the hills directly overlooking Boulder, with elevations ranging from 5,800 feet (1,800 m) at the eastern base of the hills to 6,953 feet (2,119 m) on a hilltop near the western edge of the CDP.