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Here are some results from Census 2010 for Pennsylvania.
Top five cities:
Philadelphia 1,526,006 (increase)
Pittsburgh 305,704 (decrease)
Allentown 118,032 (increase)
Erie 101,786 (decrease)
Reading 88,082 (increase)
Top five counties:
Philadelphia 1,526,006 (increase)
Allegheny 1,223,348 (decrease)
Montgomery 799,874 (increase)
Bucks 625,249 (increase)
Delaware 558,979 (increase)
Lancaster County is Pennsylvania’s sixth largest county with a population of 519,445 (increase).
Other 2010 Pennsylvania city/borough census data:
Boyertown’s population increased to 4,055
Royersford’s population increased to 4,752
Collegeville’s population decreased to 5,089
Pottsville’s population decreased to 14,324
Lansdale’s population increased to 16,269
Pottstown’s population increased to 22,377
Easton’s population increase to 26,800
Norristown’s population increased to 34,324
Wilkes-Barre’s population decreased to 41,498
York’s population increased to 43,718
Harrisburg’s population increased to 49,528
Lancaster’s population increased to 59,322
Bethlehem’s population increased to 74,982
Scranton’s population decreased to 76,089
Local townships – 2010 data:
West Pottsgrove Township’s population increased to 3,874
Upper Pottsgrove Township’s population increased to 5,315
Douglas (Montgomery) Township’s population increased to 10,195
New Hanover Township’s population increased to 10,939
Lower Pottsgrove Township’s population increased to 12,059
Amity Township’s population increased to 12,583
Limerick Township’s population increased to 18,074
To view the entire municipal census data, click on this link: http://www.psats3.org/
You will see 2010 census results for Pennsylvania municipalities now available. You can download a read only spreadsheet in alphabetical order by county, then by municipality name.
Pennsylvania will lose another congressional seat. We will drop from 19 to 18 seats in the U.S. House of Representatives. Pennsylvania’s population increased; however, there are other states whose populations are increasing faster. Pennsylvania’s population grew by 3.4% between 2000 and 2010. The Commonwealth’s official population stands at 12,702,379. 421,000 new Pennsylvanians were added since the 2000 census.
The national population growth rate is 9.7%. States with higher population growth tend to be pro-business states. Pennsylvania’s corporate tax is the highest in the nation at 9.9% which is a huge reason that is slowing down our growth!
Roy's Rants - For Your Information 
This does not surprise me at all that Philly gained and Pittsburgh lost people.Just look at who was Governor the last 8 years.Fast Eddie always favored Philly and everyone else was screwed,specially Pittsburgh.If Pittsburgh is suppose to be the “Most Livable City”,then how is it that Pittsburgh lost well over a million people the last 10 years.
I just hope now that we have a Pittsburgh boy in Harrisburg,we can get some help over on this side (Western Pa) of the state.