In the 1850 US Census for Marcy, Oneida County, New York an Augustus Barnum was enumerated with the family of Jabez Cary, as follows:
Dwelling #50; Family #50
Augustus Barnum, 11, M, b. New York, Attended school within the year
Veterans Administration pension records list an Augustus Barnum as a 1st Assistant Engineer, with the relative rank of lieutenant, in the US Navy. his wife, Jeannette G. Barnum, received a pension as a Navy Widow. The address given on her pension records was: 212 W. 20th St., New York, N.Y.