Senators 21 / 21
William M. Gwin (1805)
William Morris Stewart (1827)
William P. Dillingham (1843)
William Plumer (1759)
William Proxmire (1915)
William R. Laird III (1916)
William S. Archer (1789)
William S. Fulton (1795)
William Samuel Johnson (1727)
William Scott Vare (1867)
William Sharon (1821)
William Smith (1762)
William T. Williams (1942)
William Upham (1792)
William V. Allen (1847)
Willie Person Mangum (1792)
Willis Benson Machen (1810)
Willis Smith (1887)
Winston L. Prouty (1906)
Wyche Fowler (1940)
Wyman B. S. Moor (1811)
Yolanda Pulecio (1939)
Zales Ecton (1898)
Zulema Jattin Corrales (1969)