this is a chronological listing of the united states senators from pennsylvania. united states senators are popularly elected, for a six-year term, beginning january 3. elections are held the first tuesday after november 1. before 1914, they were chosen by the pennsylvania general assembly, and before 1935, their terms began march 4. ==class 1== class 1 u.s. senators belong to the electoral cycle that were elected for one session of the u.s. congress in the first election of 1788 and whose seats in recent years are contested in 1994, 2000, 2006, and 2012. {| class=wikitable style="text-align:center" |- valign=bottom ! # ! senator ! party ! years ! congress ! term ! electoral history |- ! 1 | align=left nowrap | 75px william maclay |  | anti-administration | nowrap | march 4, 1789 âmarch 3, 1791 | 1 | 1 | elected in 1788lost re-election |- | rowspan=2 colspan=3 | vacant | rowspan=2 nowrap | march 4, 1791 âdecember 1, 1793 | 2 | rowspan=6 | 2 | |- | rowspan=3 | 3 |- ! 2 | align=left nowrap | 75px albert gallatin |  | anti-administration | nowrap | december 2, 1793 âfebruary 28, 1794 | elected in early 1793election voided on the grounds that he had not met the residency requirements for eligibility to the office. |- | colspan=3 | vacant | nowrap | march 1, 1794 âapril 23, 1794 | |- ! rowspan=5 | 3 | rowspan=5 align=left nowrap | 75px james ross | rowspan=5  | federalist | rowspan=5 nowrap | april 24, 1794 âmarch 3, 1803 | 3(continued) | rowspan=2 | elected to finish gallatin's term |- | 4 |- | 5 | rowspan=3 | 3 | rowspan=3 | re-elected in 1797 |- | 6 |- | 7 |- ! rowspan=3 | 4 | rowspan=3 | samuel maclay | rowspan=3  | democratic-republican | rowspan=3 nowrap | march 4, 1803 
Lists_of_Pennsylvania_politicians Lists_of_United_States_Senators_by_state United_States_Senators_from_Pennsylvania