Cascade is an unincorporated community and U.S. Post Office in El Paso County, Colorado, United States. The ZIP Code of the Cascade Post Office is 80809.It was a resort town, with 3 hotels, from the 1880s to the 1920s. Tourists traveled through Ute Pass on the Colorado Midland Railway, experiencing scenic views of Cascade canon and its falls during their journey. Carriage tours brought tourists up Pikes Pike to its summit.