Bismarck, AR

ZIP code 71929 serves Caddo Gap, an unincorporated community in Montgomery County, Arkansas, in the Ouachita Mountains. Its best-known natural landmark is the Caddo River, which runs through the area and attracts visitors for paddling and fishing. The community is also associated with the Civil War Battle of Caddo Gap, commemorated by a historical marker, and is surrounded by the Ouachita National Forest.