From the AP:
Pennsylvania has added about 324,000 people since the 2000 census, ranking it a very average 21st among states, according to preliminary figures. The 2.6 percent growth rate, however, is among the weakest in the nation.
The commonwealth’s newcomers are concentrated in the Pocono mountains region that straddles Interstate 80 near New Jersey; the suburbs of Philadelphia, particularly booming Chester County; and the south-central Pennsylvania region along the Mason-Dixon Line that runs through Gettysburg, York and Lancaster.
According to the census estimates, Philadelphia has grown by about 2 percent, while Allegheny County, which includes Pittsburgh, has shrunk by nearly 5 percent. Population decline is concentrated in the western counties.
Intriguingly, about half of Pennsylvania’s total estimated growth over the past decade, or some 176,000 people, consists of people who have moved to the state from foreign countries. In terms of state-to-state migration, Pennsylvania has had a net loss of about 40,000 people.
Redistricting goes on in two tracks — one for Congress, the other for the state Legislature.