66th United States Congress

The apportionment of seats in the House of Representatives was based on the 1910 United States census.

The Republicans won majorities in both the House and the Senate, thus taking control of both chambers.

[3] A brief special session was called by President Wilson in March 1919, because of a filibuster that had successfully blocked appropriations bills needed to fund day-to-day government operations.

The names of members of the House of Representatives are preceded by their district numbers.

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.

Senators' party membership by state at the opening of the 66th Congress in March 1919.
2 Democrats
1 Democrat and 1 Republican
2 Republicans
Senate Elections Committee engaged in the counting of the Ford-Newberry vote. Tellers in the foreground of the picture are Senators Walter E. Edge and Selden P. Spencer .
House seats by party holding plurality in state
80+% to 100% Democratic
80+% to 100% Republican
60+% to 80% Democratic
60+% to 80% Republican
Up to 60% Democratic
Up to 60% Republican