James Duncan (1756 – June 24, 1844) was a member of the United States House of Representatives from Pennsylvania.
James Duncan born in Philadelphia, Pennsylvania.
He served as the first prothonotary of Adams County, Pennsylvania.
During the American Revolutionary War he was appointed as a lieutenant in Colonel Moses Hazen’s 2nd Canadian Regiment on November 3, 1776, and on March 25, 1778, was promoted to captain.
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