High Quality Content by WIKIPEDIA articles! The Twenty-ninth United States Congress was a meeting of the legislative branch of the United States federal government, consisting of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from March 4, 1845 to March 3, 1847, during the first two years of the administration of James Polk`s presidency. The apportionment of seats in the House of Representatives was based on the Sixth Census of the United States in 1840. Both chambers had a Democratic majority.