John I. De Graff
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John Isaac De Graff (October 2, 1783 - July 26, 1848) was a U.S. Representative from New York.
Born in Schenectady, New York, De Graff attended the common schools and Union College, Schenectady, New York, in 1811. He engaged in mercantile pursuits in Schenectady. He served in the War of 1812.
De Graff was elected as a Jacksonian to the Twentieth Congress (March 4, 1827-March 3, 1829). He served as mayor of Schenectady 1832-1834 and again in 1836.
De Graff was elected as a Democrat to the Twenty-fifth Congress (March 4, 1837-March 3, 1839). He was not a candidate for renomination. He engaged in mercantile pursuits. He was interested in the building of the Mohawk &. Hudson Railroad. He again served as mayor of Schenectady in 1842 and 1845. He engaged in banking until his death in Schenectady, New York, July 26, 1848. He was interred in Vale Cemetery.
