Ward served in the Massachusetts House of Representatives again in 1811 and, in 1812, was elected to the United States House of Representatives. He was reelected in 1814. He served in the Thirteenth and Fourteenth Congresses (March 4, 1813 – March 3, 1817).
Ward served in the Massachusetts State Senate in 1818 and 1819, and was a member of the State constitutional convention in 1820.
From 1820 to 1839 Ward was Chief Justice of Boston's Court of Common Pleas from 1820 to 1839.
He was a member of the Harvard University Board of Overseers from 1810 to 1844.