St. Ann Highlands or Saint Ann Highlands[1] is an unincorporated community and a census-designated place (CDP) located in and governed by Boulder County, Colorado, United States.

The population of the St. Ann Highlands CDP was 325 at the United States Census 2020.

[3] The Nederland post office (Zip Code 80466) serves the area.

[4] St. Ann Highlands is located in southern Boulder County, 4 miles (6 km) northeast of the town of Nederland.

State Highway 119 forms the southern edge of the CDP, connecting Nederland to the west with Boulder 12 miles (19 km) to the east.