In the 1850 US Census for Carlton, Orleans County, New York the family of Abel J. Barnum was enumerated as follows:
Dwelling #122; Family #123
Abel J. Barnum, 40, M, Farmer, Real property $150
Dennis Wright, 30, M, Farmer
Sarah Wright, 19, F
Adwilly Wright, 1, M
Julia Barnum, 16, F
John Barnum, 12, M, Attended school within the year
Abel Barnum, 10, M, Attended school within the year
Anna Barnum, 7, F, Attended school within the year
Dennis Barnum, 5, M
No supporting documentation has been found for David Andrew Barnum, Harvey Handy Barnum and Barnet Mackey Barnum, the last three children of Abel J. Barnum and Betsy Fuller shown in this entry. Various census entries exist, however, for persons named Harvey Handy and Barnet Mackey. The Barnum Family, 1350-1907 gives a birth date of 1805, while the 1850 Census shows his birth year as about 1810.