Duncanville Independent School District is a school district based in Duncanville, Texas (USA). Duncanville ISD serves almost all of the city of Duncanville and portions of DeSoto, Dallas, and Cedar Hill. The district is receiving a high number of Hispanics coming in, and a slightly decreasing number of African Americans. This can be due to the Hispanics moving in from areas such as Oak Cliff and South Dallas, and African Americans moving to areas such as Cedar Hill, DeSoto, and to a lesser extent, Midlothian.