In the 1850 US Census for Decatur, Washington County, Ohio the family of John Barnum was enumerated as follows:
Dwelling #112; Family #113
John Barnum, 49, M, Farmer, Real property $1,000, b. Pennsylvania
Nancy Barnum, 42, F, b. Pennsylvania, Person over 20 years of age who cannot read or write
Mary Barnum, 16, F. b. Ohio, Attended school within the year
David Barnum, 14, M. b. Ohio, Attended school within the year
Wm. Barnum, 13, M. b. Ohio, Attended school within the year
Margaret Barnum, 11, F. b. Ohio, Attended school within the year
Henry Barnum, 10, M. b. Ohio, Attended school within the year
Elizabeth Barnum, 8, F. b. Ohio, Attended school within the year
Samuel Barnum, 6, F. b. Ohio, Attended school within the year
Nancy J. Williamson, 18, F. b. Ohio, Attended school within the year