Allen Earp was the son of Josiah and Ellender Hawker Earp. He married Mary Ann "Polly" Stogsdill on January 23, 1819 in Pulaski County, Kentucky. They moved to Polk County, Arkansas in the early 1850s. Some of there children were already there and some came with them. Allen and Mary Earp had the following children:
Archibald "Arch" Susannah Ellender "Nell" John Wesley Matilda Caroline William Harrison Katherine "Kate" Josiah Mary Ann "Polly"