In the 1850 US Census for Burns, Allegany County, New York the family of Dimon B. Barnum was enumerated as follows:
Dwelling #915; Family #1005
Dimon B. Barnum, 50, M, Farmer, Real property $2,040, b. Connecticut
Mary M. Barnum, 44, F, b. Connecticut
Abiram W. Barnum, 24, M, Farmer, b. Connecticut
Ira K. Barnum, 16, M, b. Connecticut, Attended school within the year
Willis H. Barnum, 7, M, b. Connecticut, Attended school within the year
Sarah Gorham, 16, F, b. Connecticut, Attended school within the year
He was buried in Canaseroga Cemetery. The record reads; Barnum Dimon B., Died Nov 5, 1865, Age 66, Old Cemetery Section.