In the 1850 US Census for New Fairfield, Fairfield County, Connecticut the family of David S. Barnum was enumerated as follows:
Dwelling #170; Family #187
David Barnum, 30, M, Farmer, Real property $500, b. Connecticut
Ann Barnum, 25, F, b. Connecticut
Leroy Barnum, 3, M, b. Connecticut
David Barnum served as a Civil War soldier in Company "K", 23rd Regiment, Connecticut Volunteer Infantry from August 28, 1862 to August 31, 1863.
Gravestone inscription: Co. K. 23d Reg. / Conn. Vols.