The apportionment of seats in the House of Representatives was based on the 1930 United States census.

With President Roosevelt, the Democrats maintained an overall federal government trifecta.

Senators were popularly elected statewide 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, In this Congress, Class 1 meant their term ended with this Congress, requiring reelection in 1940; Class 2 meant their term began in the last Congress, requiring reelection in 1942; and Class 3 meant their term began in this Congress, requiring reelection in 1944.

The directory after the pages of terms of service lists committees of the Senate, House (Standing with Subcommittees, Select and Special) and Joint and, after that, House/Senate committee assignments.