The apportionment of seats in this House of Representatives was based on the 1840 United States census.

Following the 1840 United States census, Congress reapportioned the House to include 223 seats.

[2] During this congress, one House seat was added for the new state of Florida.

Senators were elected by the state legislatures every two years, with one-third beginning new six-year terms with each Congress.

Preceding the names in the list below are Senate class numbers, which indicate the cycle of their election.