Ponca is an unincorporated community in Newton County, Arkansas, United States. Ponca is located on Arkansas Highway 43, 10 miles (16 km) west of Jasper. Ponca has a post office with ZIP code 72670. Ponca is well known for its access to the Buffalo National River, which is a hub for naturalist as well as photography and hiking tourism. Ponca is also known for the regular sightings of elk, which reside in the Boxley Valley.