Cascade is an unincorporated town and U.S. Post Office in El Paso County, Colorado, United States. The ZIP Code of the Cascade Post Office is 80809. The town of Cascade was established in 1886. The town was named for the many waterfalls in the area. The Cascade Post Office opened on August 16, 1887.Cascade has its very own gourmet popcorn store and amusement park. In 1889, the Pikes Peak carriage road was constructed from Cascade to the top of Pikes Peak.