Rev. McAllister is married to Mrs. Joan Marla Bulle McAllister, formerly of Elizabeth, New Jersey (Mount Teman AME Church). They have three children: Rev. Dr. Julius H. McAllister, Jr., (his wife, Deana Young McAllister) the pastor of Greater Institutional AME Church in Chicago, Illinois; Juanita Michelle Caldwell (her husband, Francoise Caldwell), middle school guidance counselor, and Jocelyn Marla McAllister, graduate student and assistant director of a  child development center. They also have five grandchildren: Julius Harrison McAllister III, BreAnna Michelle Caldwell, Colin McKinley Young McAllister, Jaelan Harrison Caldwell, and Dylan David Jeremiah McAllister.