Stedman was elected as a Federalist to the Eighth Congress. He was elected from the Massachusetts's 11th congressional district. The district he represented had been drawn in the redistricting following the 1800 census. It essentially covered the area of Worcester and northward to the New Hampshire border.[1] Stedman was reelected to three succeeding Congresses and served from March 4, 1803, until his resignation July 16, 1810. He served as clerk of Worcester County Courts 1810-1816. Stedman was elected a member of the American Antiquarian Society in 1813,[2] and also served on its board of councilors from 1815 to 1816.[3] Later in life moved to Newburyport, Massachusetts, where he died August 31, 1831. He was interred in Old Hill Burying Ground.
William Stedman married Almy Ellery (Feb 14, 1759 - December 25, 1839). She was a sister of Elizabeth Ellery, who married Hon. Francis Dana, and also of Lucy Ellery who married William Channing (parents of William Ellery Channing, a founder of the Unitarian Church.)