Philadelphia is a city in the state of Pennsylvania of the United States.
Before Day 1 Edit
As a child, future President of the United States David Palmer spent time there, according to the Presidential memoirs he was writing when he was assassinated. It is unclear however if he was born there or just lived there.
Day 1 Edit
Day 4 Edit
After the nuclear missile was launched, the White House believed the terrorists' target was ether New York City or Washington DC and wanted both cities evacuated immediately. But David Palmer, brought in as an adviser to President Logan, thought that an evacuation would be hazardous by causing a mass exodus of people in the other major cities on the East Coast including Philadelphia, as well as Boston, Baltimore and Atlanta.