Bismarck is an unincorporated community on Hwy 7 and 84 in Hot Springs County. It is located between Hot Springs and Caddo Valley.

The community is located near DeGray Lake and DeGray Lake Resort State Park is located in the community. This state park is Arkansas's only resort state park and is located about eight miles north of Arkadelphia on 13,800-acre DeGray Lake, formed when the Caddo River was dammed in 1972. Located on an island and reached by a short causeway, the park has a 96-room lodge.