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David Thomas (June 11, 1762 Pelham, Hampshire County, Massachusetts – November 27, 1831 Providence, Rhode Island) was an American politician. He served three full terms and one partial term in the United States House of Representatives, and three years as New York State Treasurer.
Thomas was educated in Pelham, and was a veteran of the American Revolution. In 1777 he joined a militia unit which traveled from Massachusetts to defend Rhode Island from the British Army. In 1781 he joined the Fifth Massachusetts Regiment as a corporal, and later became a sergeant in the Third Massachusetts Regiment.
He moved to Salem, New York, in 1784, where he owned and operated a tavern for several years. He was commissioned a captain in the New York State Militia in 1786 and rose to the rank of major general of the northern division of the militia in 1805.
He was a member of the New York State Assembly from Washington and Clinton Counties in 1794, and from Washington County from 1798 to 1800. He was town supervisor of Salem from 1797 to 1800, and a justice of the peace from 1798 to 1801, in 1804 and 1811.