District boundaries since 2023
After the 2000 census, the Commonwealth of Pennsylvania was divided into 19 congressional districts, decreasing from 21 due to reapportionment.
After the 2010 census, the number of districts decreased again to 18. In the 2022 midterms, per the 2020 United States census, Pennsylvania lost one congressional seat, bringing the delegation's number to 17 districts.[1]
- ^ Merica, Dan; Stark, Liz (April 26, 2021). "Census Bureau announces 331 million people in US, Texas will add two congressional seats". CNN. Retrieved April 26, 2021.