In the 1850 US Census for Hannibal, Oswego County, New York the family of John Barnum was enumerated as follows;
Dwelling #448; Family #481
John Barnum, 40, M, Farmer, b. New York
Susan Barnum, 41, F, b. New york
Stephen Barnum, 12, M, b. New York, Attended school within the year
James Barnum, 18, M, b. New York
Lucinda Barnum 17, F, b. New York, Attended school within the year
R. Barnum, 10, M, b. New York, Attended school within the year
George Barnum, 9, M, b. New York, Attended school within the year
Hellen Barnum, 8, F, b. New York
William Barnum, 3, M, b. New York
Smith Barnes Barnum, 1, M, b. New York