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William Clark (June 25, 1811, in Cooperstown, Otsego County, New York – May 28, 1885) was an American politician from New York.
He was the son of Cyrenus Clark (born 1772) and Rachel (Tracy) Clark (born 1777). In 1836, he married Anna Maria Newkirk (1819–1854).
He engaged in the produce and forwarding business at Fort Plain. He was at times Supervisor of the Town of Minden; and a trustee and President of the Village of Fort Plain.
He was a member of the New York State Assembly (Montgomery Co., 2nd D.) in 1852; and of the New York State Senate (15th D.) in 1863.