Elections to the United States House of Representatives for the 29th Congress were held at different dates in the various states from July 1, 1844 (Louisiana) to November 4, 1845 (Mississippi). All 227 members of the House of Representatives elected took their seats when Congress convened December 1, 1845. The elections mostly coincided with the 1844 presidential election, won by dark horse Democratic candidate James K. Polk, who won on a campaign advocating territorial expansion. The new states of Florida, Texas and Iowa were added during this Congress. Florida had actually been admitted on the last day of the 28th Congress, but was not represented until the 29th. Iowa and Texas both elected their first representatives in 1846.