Rollinsville is a census-designated place (CDP) and post office in and governed by Gilpin County, Colorado, United States.

[4] At the United States Census 2020, the population of the Rollinsville CDP was 194.

[6] Rollinsville is located in the mountains southwest of the city of Boulder, on the flank of a hill above South Boulder Creek along State Highway 119 between Nederland and Black Hawk.

It consists of a small cluster of residences and several businesses at the terminus of the road leading westward up to Rollins Pass at the summit of the Front Range.

The creek follows the railroad tracks into a small canyon and emerges near the Boulder/Gilpin county border before flowing through Pinecliffe.