From: Genealogical and Family History of Western New York: a Record of the Achievements of Her People in the Making of a Commonwealth and the Holding of a Nation. William Richard Cutter, Lewis Historical Pub. Co., 1912, pages 520-521:
Stephen Ostrom Barnum, son of Ezra Smith Barnum was born in Utica, NY in January 1815, died in Buffalo, NY, October 1899, and is buried in Forest Lawn Cemetery. In 1845, he founded in Buffalo the wholesale and retail novelty business of Barnum Brothers at 265 Main Street following the same lines that his father so successfully followed in Utica. He was very prosperous and left a business firmly established. He was a director of White’s Bank of Buffalo, and a man of influence in the Democratic party. He was offered the nomination for mayor of Buffalo, but would not consent to run for office. He married, in Utica, in 1841, Elizabeth Chatfield. Children: 1) Theodore Downs Barnum; 2) Henry died unmarried; 3) Frederick, deceased was an active member of the Buffalo Volunteer Fire Department; 4) Frank died at the age of 16 years; 5) Fanny, died at the age of 13 years.
In the 1850 US Census for Buffalo Ward 4, Erie County, New York the family of Stephen O. Barnum was enumerated as follows:
Dwelling #988; Family #1090
S. O. Barnum, 34, M, Keeps a variety store, b. New York
Elizabeth Barnum, 32, F, b. New York
Theodore D. Barnum, 8, M, b. New York, Attended school within the year
Frederick Barnum, 5, M, b. New York, Attended school within the year
Henry F. Barnum, 3, M, b. New York
Phaney Barnum, 8/12, F, b. New York
Joseph Barnum, 14, M, b. New York
Catherin Kirst, 17, F, b. Germany
A US Passport was issued to Stephen O. Barnum on 3 Feb 1864. He was described as 48 years old, 5 feet 7 inches tall, high forehead, blue eyes, straight nose, medium mouth, round chin, brown hair light complexion, and broad face.