Delazon Barnum and family were listed in the US Census of 1840 for Butler County, Ohio.
In the 1850 US Census for Union, Union County, Indiana the family of Delazon Barnum was enumerated as follows:
Dwelling #831; Family #831
Delazon Barnum, 28 [sic], M, Millwright, Real property $1,500, b. Connecticut
Clarissa Barnum, 31, F, b. Virginia
Elizabeth A. Barnum, 11, F, b. Ohio, Attended school within the year
Sarah C. Barnum, 7, F, b. Indiana, Attended school within the year
Mary M. Barnum, 5, F, b. Indiana
Amanda J. Barnum, 3, F, b. Indiana
[Note: his age, shown as 28, should have been shown as 38].
Delazon was enumerated in the 1860 and 1870 Censuses for Billingsville, Union, Indiana; the 1880 Census for Union, Union, Indiana and the 1900 Census for Billingsville, Union, Indiana. In the latter, he was shown as aged 89 years.