Longest-serving US senator
- Who
- Robert Byrd
- What
- 51/177 year(s):day(s)
- Where
- United States
- When
- 28 June 2010
As of 18 June 2013, the longest serving US senator is Democrat Robert Byrd (USA, 20 November 1917–28 June 2010), who represented the state of West Virginia. He was a member of the senate from 3 January 1959 until his death on 28 June 2010, a total of 51 years 177 days.