Found him on the 1900 Olean, Cattaraugus, New York census (dist 59 img 23) as
William Wittenburg age 38. Came to the U.S. in 1863.
Found him on the 1905 Olean Ward 5, Cattaraugus, New York state census (E.D.01 img 18) as
William Wittenburg age 43. His wife and 7 children are in the household. [these are presumed to be step-children, from Mary's first husband
August Kleinsmith - D.F.]
Found him on the 1920 Olean Ward 7, Cattaraugus, New York census (dist 82 img 15) as
William Wittenburg age 57. Laborer railroad shop.
The funeral of William Wittenburg, 57 years old of 130 North Fifteenth street, took place in the Immanuel Lutheran church at 2:30 o'clock this afternoon. Rev. Martin Gallmeier officiated. Burial was made in the Allegany cemetery.
He is survived by his wife; five sons, Charles, Edward, William, Henry and Frederick, all of Olean; two daughters, Mrs. Alfred Struble and Marie Wittenburg, of this city. - Buffalo Evening News February 17, 1920