This is a list of the severalUnited States Congresses, since their beginning in 1789, including their beginnings, endings, and the dates of their individual sessions. Each electedbicameral Congress (of the two chambers of theSenate and theHouse of Representatives) lasts for two years and begins on January 3 of odd-numbered years.

Before theTwentieth Amendment to the United States Constitution (ratified January 23, 1933), which moved and fixed new Congressional dates, on which an American Congress began and ended, designated from the original provisions of the Constitution of 1787, was previously either March 3 or March 4, (in tandem then with dates of presidentialinaugurations every fourth year which were moved by the same constitutional amendment to January 20).

• History of the United States Senate
• Party divisions of United States Congresses
• Timeline of Washington, D.C. – Major events in the history of the city of Washington, District of Columbia

• "Dates of Sessions of the Congress, (1789-present)".United States Senate – via Senate.gov.
• "Days in Session of the U.S. Congress".Library of Congress – via Congress.gov.
• "Past Days in Session of the U.S. Congress".Library of Congress – via Congress.gov.
• "U.S. Congressional Calendars".Library of Congress – via Congress.gov.

• United States Congresses
• United States politics-related lists
• Lists related to the United States Congress

• Articles with short description
• Short description is different from Wikidata
• Use mdy dates from April 2025