Rollinsville is a census-designated place and a U.S. Post Office located in Gilpin County, Colorado, United States. The population as of the 2010 Census was 181.It 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 population as of the 2010 Census was 181. The Rollinsville Post Office has the ZIP Code 80474.
Rollinsville was named for Joseph Rollins, a surveyor with the railroads circa 1880. Mr. Rollins and his wife, Charlotte, settled in the Indianola, Nebraska area where they raised their family consisting of John, Preston, George, and Roxie. Joseph and Charlotte are buried in the Inidanola Cemetery.