These are tables of congressional delegations from Pennsylvania to the United States House of Representatives and the United States Senate. The current dean of the Pennsylvania delegation is Senator Bob Casey Jr., having served in the Senate since 2007. United States House of Representatives Current U.S. House of Representatives from Pennsylvania List of members, their terms in office, district boundaries, and the district political ratings according to the CPVI. The delegation has 17 members, with 9 Democrats and 8 Republicans. 1789–1793: 8 seats For the first two Congresses, Pennsylvania had eight seats. In the First Congress, Representatives were selected at-large on a general ticket. Districts were used in the Second Congress. 1793–1803: 13 seats Pennsylvania had thirteen seats. For the third Congress representatives were selected at-large on a general ticket. After that, districts were created. 1803–1813: 18 seats There were eighteen seats, apportioned among eleven districts. Districts 1–3 each had three seats elected on a general ticket. District 4 had two such seats. Districts 5–11 each had one seat. 1813–1823: 23 seats There were 15 districts. The 1st district had four seats elected on a general ticket. The 2nd, 3rd, 5th, 6th and 10th each had two seats elected on a general ticket. The rest of the districts each had one seat. 1823–1833: 26 seats 1833–1843: 28 seats Following the 1830 census, Pennsylvania was apportioned 28 seats. The commonwealth divided them into 25 districts and two districts, the and the , had two and three seats respectively. 1843–1853: 24 seats 1853–1863: 25 seats 1863–1873: 24 seats 1873–1883: 27 seats 1883–1893: 28 seats Following the 1880 census, the delegation grew by one seat. Until 1889, that seat was elected at-large statewide. After 1889, the state was redistricted into 28 districts. 1893–1903: 30 seats Following the 1890 census, the delegation grew by two seats. Those two additional seats were elected at-large across the entire commonwealth. 1903–1913: 32 seats Following the 1900 census, the delegation grew by two seats. 1913–1933: 36 seats Following the 1910 census, the delegation grew by four seats to its largest size to date. The four new seats were elected at-large statewide. Starting in 1923, however, four new districts were added to replace the at-large seats. The results of the 1920 census revealed a major and continuing shift of the population of the U.S. from rural to urban areas. However, no apportionment was carried out following the 1920 census