List of longest-serving members of the United States Congress

This list of members of the United States Congress by longevity of service includes representatives and senators who have served for at least 36 years, in the United States Senate, the United States House of Representatives, or both. In cases where there is a tie in time, the following criteria will sort people higher: Achieved time uninterrupted (for total tenure ranks) Achieved time first Senators over representatives (for Senate and House lists) Senate and House seniority == Key == == Combined U.S. Senate and U.S. House time == == U.S. Senate time == The 90th Congress was notable because for a period of 10 days (December 24, 1968 – January 3, 1969), it contained within the Senate, all 10 of what was at one point the top 10 longest-serving senators in history (Byrd, Inouye, Thurmond, Kennedy, Hayden, Stennis, Stevens, Hollings, Russell Jr., and Long) until January 7, 2013, when Patrick Leahy surpassed Russell B. Long as the 10th longest-serving senator in history.

Source: Wikipedia — List of longest-serving members of the United States Congress (CC BY-SA 4.0)