The Sixty-sixth United States Congress was a meeting of the legislative branch of the United States federal government, comprising the United States Senate and the United States House of Representatives. It met in Washington, DC from March 4, 1919, to March 4, 1921, during the last two years of Woodrow Wilson's presidency. The apportionment of seats in the House of Representatives was based on the Thirteenth Census of the United States in 1910. Both chambers had a Republican majority.
|66th United States Congress|
United States Capitol (1906)
|March 4, 1919 – March 4, 1921|
|Senate President||Thomas R. Marshall (D)|
|Senate President pro tem||Albert B. Cummins (R)|
|House Speaker||Frederick H. Gillett (R)|
435 members of the House
5 non-voting delegates
|1st: May 19, 1919 – November 19, 1919|
2nd: December 1, 1919 – June 5, 1920
3rd: December 6, 1920 – March 3, 1921
(shading shows control)
|End of the previous congress||49||47||96||0|
|Final voting share||47.9%||52.1%|
|Beginning of the next congress||37||59||96||0|
TOTAL members: 435
In this Congress, Class 3 meant their term ended with this Congress, requiring reelection in 1920; Class 1 meant their term began in the last Congress, requiring reelection in 1922; and Class 2 meant their term began in this Congress, requiring reelection in 1924.
The names of members of the House of Representatives are preceded by their district numbers.
The count below reflects changes from the beginning of the first session of this Congress.
|State||Senator||Reason for Vacancy||Successor||Date of Successor's Installation|
|Thomas S. Martin (D)||Died November 12, 1919. Successor was appointed and subsequently elected.||Carter Glass (D)||February 2, 1920|
|John H. Bankhead (D)||Died March 1, 1920. Successor was appointed.||B. B. Comer (D)||March 5, 1920|
|B. B. Comer (D)||Successor was elected.||J. Thomas Heflin (D)||November 3, 1920|
|Warren G. Harding (R)||Resigned January 13, 1921, after being elected President of the United States.
Successor was appointed having already been elected to the next term.
|Frank B. Willis (R)||January 14, 1921|
|John F. Nugent (D)||Resigned January 14, 1921, after losing election and subsequently being appointed to the Federal Trade Commission.
Successor was appointed having already been elected to the next term..
|Frank R. Gooding (R)||January 15, 1921|
|District||Vacator||Reason for Vacancy||Successor|
|Texas 12th||Vacant||Rep. James C. Wilson died during previous congress||Fritz G. Lanham (D)||April 19, 1919|
|Virginia 8th||Vacant||Rep. Charles C. Carlin resigned during previous congress||R. Walton Moore (D)||April 19, 1919|
|Kentucky 8th||Vacant||Rep. Harvey Helm died during previous congress||King Swope (R)||August 1, 1919|
|Louisiana 1st||Albert Estopinal (D)||Died April 28, 1919||James O'Connor (D)||June 5, 1919|
|Alaska Territory||Charles A. Sulzer (D)||Died April 28, 1919||George B. Grigsby (D)||June 30, 1920|
|Alabama 7th||John L. Burnett (D)||Died May 13, 1919||Lilius Bratton Rainey (D)||September 30, 1919|
|Minnesota 4th||Carl Van Dyke (D)||Died May 20, 1919||Oscar Keller (R)||July 1, 1919|
|South Carolina 6th||J. Willard Ragsdale (D)||Died July 23, 1919||Philip H. Stoll (D)||October 7, 1919|
|South Carolina 7th||Asbury F. Lever (D)||Resigned August 1, 1919, after becoming member of the Federal Farm Loan Board||Edward C. Mann (D)||October 7, 1919|
|Oklahoma 5th||Joseph B. Thompson (D)||Died September 18, 1919||John W. Harreld (R)||November 8, 1919|
|Massachusetts 10th||John F. Fitzgerald (D)||Lost contested election October 23, 1919||Peter F. Tague (D)||October 23, 1919|
|North Carolina 9th||Edwin Y. Webb (D)||Resigned November 10, 1919, after being appointed United States District Court for the Western District of North Carolina||Clyde R. Hoey (D)||December 16, 1919|
|Wisconsin 5th||Victor L. Berger (Socialist)||Ousted November 10, 1919, due to his conviction under the Espionage Act of 1917||Seat remained vacant until next Congress|
|Missouri 3rd||Joshua W. Alexander (D)||Resigned December 15, 1919, after being appointed United States Secretary of Commerce||Jacob L. Milligan (D)||February 14, 1920|
|Virginia 4th||Walter A. Watson (D)||Died December 24, 1919||Patrick H. Drewry (D)||April 27, 1920|
|New York 10th||Reuben L. Haskell (R)||Resigned December 31, 1919||Lester D. Volk (R)||November 2, 1920|
|New York 14th||Fiorello H. La Guardia (R)||Resigned December 31, 1919, after being elected President of the New York City Board of Aldermen||Nathan D. Perlman (R)||November 2, 1920|
|Pennsylvania 3rd||J. Hampton Moore (R)||Resigned January 4, 1920, after being elected Mayor of Philadelphia||Harry C. Ransley (R)||November 2, 1920|
|Virginia 5th||Edward W. Saunders (D)||Resigned February 29, 1920, after being elected judge of State Supreme Court of Appeals||Rorer A. James (D)||June 1, 1920|
|Philippines At-large||Teodoro R. Yangco||Term expired March 3, 1920||Isauro Gabaldon||March 4, 1920|
|New Jersey 1st||William J. Browning (R)||Died March 24, 1920||Francis F. Patterson, Jr. (R)||November 2, 1920|
|Michigan 13th||Charles A. Nichols (R)||Died April 25, 1920||Clarence J. McLeod (R)||November 2, 1920|
|New York 26th||Edmund Platt (R)||Resigned June 7, 1920, after being appointed to the Federal Reserve Board||Hamilton Fish III (R)||November 2, 1920|
|Oklahoma 8th||Dick T. Morgan (R)||Died July 4, 1920||Charles Swindall (R)||November 2, 1920|
|Alabama 5th||J. Thomas Heflin (D)||Resigned November 1, 1920, after being elected to the U.S. Senate||William B. Bowling (D)||December 14, 1920|
|Pennsylvania At-large||Mahlon M. Garland (R)||Died November 19, 1920||Seat remained vacant until next Congress|
|New York 3rd||John MacCrate (R)||Resigned December 30, 1920, after being elected justice to the Supreme Court of the State of New York||Seat remained vacant until next Congress|
|Massachusetts 9th||Alvan T. Fuller (R)||Resigned January 5, 1921, after being elected Lieutenant Governor of Massachusetts||Seat remained vacant until next Congress|
|Missouri 4th||Charles F. Booher (D)||Died January 21, 1921||Seat remained vacant until next Congress|
|Alabama 4th||Fred L. Blackmon (D)||Died February 8, 1921||Seat remained vacant until next Congress|
|Pennsylvania 10th||Patrick McLane (D)||Lost contested election February 25, 1921||John R. Farr (R)||February 25, 1921|
|Alaska Territory||George B. Grigsby (D)||Lost contested election March 1, 1921||James Wickersham (R)||March 1, 1921|
Lists of committees and their party leaders, for members (House and Senate) of the committees and their assignments, go into the Official Congressional Directory at the bottom of the article and click on the link (6 links), in the directory after the pages of terms of service, you will see the committees of the Senate, House (Standing with Subcommittees, Select and Special) and Joint and after the committee pages, you will see the House/Senate committee assignments in the directory, 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.