Elections to the United States House of Representatives for the 18th Congress were held at various dates in different states between July 1822 and August 1823 during President James Monroe's second term. Following the 1820 Census, Congress added 26 seats to the House. Most relative population growth was in the West. This was the last House election during the virtually nonpartisan Era of Good Feelings and the largest midterm gain of seats by a President's party. The Democratic-Republican Party remained nationally dominant, and the Federalist Party limited to state and local influence.