In the 1860 US Census for Bangor, Franklin, New York the family of Orson W. Barnum was enumerated as follows:
Dwelling #1162; Family #1162
Watts Barnum, 31, M, Farmer, Real property $4,500, Personal property $1,200, b. New York
Ann A. Barnum, 26, F, Farmer, b. Vermont
Ida L. Barnum, 5, F, b. New York
Elijah Barnum, 74, M, Farmer, b. Vermont
[Note: Watts Barnum, in full, was Orson Watts Barnum. Elijah Barnum was his father. His mother was enumerated next door with the family of Watts' first cousin Franklin. Several more-distant cousins were living nearby.]
He was buried in North Bangor Cemetery.