Allen married Clarissa Keys on 24 Feb 1853 in Sangamon, Illinois, United States. Clarissa (daughter of Isaac Keys and Elizabeth Hess) was born in 1829 in Illinois, United States of America; died on 25 Jul 1898 in Springfield, Sangamon County, Illinois, United States of America; was buried in Springfield, Sangamon County, Illinois, United States of America. [Group Sheet] [Family Chart]