Robert O. Barnum, son of Frederick E. Barnum and Nettie Marsden, was born September 29, 1901 in Utica, NY and died January 25, 1992 in Sebring, Florida. (Florida Death Index & Obituary).
From the Tampa Tribune, Tuesday, January 28, 1992: Robert O. Barnum, 90, of Sebring, Florida died Saturday at home. A native of Utica, N.Y., he moved to this area 16 years ago from Alexandria, Va. He was a retired mathematics teacher for the U.S. Military Academy Preparatory School in New York. He was a member of First United Methodist Church and the First United Methodist Men's Club. He is survived by his wife, Catherine M.; a son, Robert J. of Wilmington, Del.; a daughter, Marilyn Wagner of Marshfield, Mass.; and four grandchildren.