Beulah Valley is a census-designated place in and governed by Pueblo County, Colorado, United States. The CDP is a part of the Pueblo, CO Metropolitan Statistical Area. The population of the Beulah Valley CDP was 518 at the United States Census 2020. The Beulah post office serves the area. Bishop Castle, constructed by Jim Bishop, otherwise known as a "one man castle", is located between Beulah and San Isabel, Colorado.