In the 1900 US Census for Danville City, Danville Tonwship, Vermilion, Illinois the family of Edwin BARNUM was enumerated as follows:
North Walnut Street; Dwelling #241; Family #296 [13 occupants, including the two below]
Barnum, Edwin J.; Boarder; W; M; b. Oct 1864; 35; M; married 11 years; b. Ohio; father b. Indiana; mother b. Kentucky; Lithotyper; employed full year; can read, write and speak English
Barnum, Selina J.; Boarder; W; F; b. Jun 1864; 35; M; married 11 years; mother of 0 children; b. Illinois; father b. Indiana; mother b. Iowa; can read, write and speak English
The Genealogical Record of the Barnum Family gives his birthdate as 15 Dec 1865.