Both chambers had a Democraticsupermajority, and with the election of PresidentLyndon B. Johnson to his own term in office, maintaining an overall federal government trifecta. This is the last time Democrats or any party had a 2/3rd supermajority in the Senate.
September 6, 1966: Pub. L.Tooltip Public Law (United States) 89–554, which (among other things) enacted what is now called the Freedom of Information Act
The count below identifies party affiliations at the beginning of the first session of this Congress, and includes members from vacancies and newly admitted states, when they were first seated. Changes resulting from subsequent replacements are shown below in the "Changes in membership" section.
This list is arranged by chamber, then by state. Senators are listed in order of seniority, and representatives are listed by district.
Senate
Senators are 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 began in this Congress, requiring reelection in 1970; Class 2 meant their term ended with this Congress, requiring reelection in 1966; and Class 3 meant their term began in the last Congress, requiring reelection in 1968.
House of Representatives
Names of members are preceded by their district numbers.
Lists of committees and their party leaders for members of the House and Senate committees can be found through the Official Congressional Directory at the bottom of this article. 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. On the committees section of the House and Senate in the Official Congressional Directory, the committee's members on the first row on the left side shows the chairman of the committee and on the right side shows the ranking member of the committee.
^Karen Tumulty (April 9, 2014). "LBJ's presidency gets another look as civil rights law marks its 50th anniversary". The Washington Post. Retrieved April 9, 2014.
Martis, Kenneth C. (1989). The Historical Atlas of Political Parties in the United States Congress. New York: Macmillan Publishing Company.
Martis, Kenneth C. (1982). The Historical Atlas of United States Congressional Districts. New York: Macmillan Publishing Company.