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Pennsylvania's 19th congressional district was a congressional district that became obsolete for the 113th Congress in 2013, due to Pennsylvania's slower population growth compared to the rest of the nation.
In its last incarnation, the district included all of Adams and York Counties, and parts of Cumberland County. The last representative was Republican Todd Russell Platts, who decided to retire at the end of the 112th Congress.
Most of the 19th district remained intact and was renumbered as the 4th district.
References
Pennsylvania's 19th congressional district Wikipedia(Text) CC BY-SA