Yes they have been reported in PA. Here's what is written about them in the 2009/2010 Game Digest.
Feral swine have no place in Pennsylvania. Feral swine refers to any pig that is found outside of captivity, which is
where they usually originate. They pose a very real threat to native Pennsylvania wildlife and wildlife habitats. Not only
do they damage wildlife habitats, but they will kill birds, the young of many mammalian species, including deer fawns,
and transmit a host of dangerous diseases. Because they have no natural predators, can live anywhere, and reproduce
rapidly, they will be difficult to control in the best of circumstances.
In many areas of the state, protection has been removed from feral swine by an executive order of the director;
however, to increase the efficiency of eradication efforts, protection may be applied to townships or counties where
eradication trapping operations are funded and being actively conducted. Please refer to our website for specific details
on townships or counties that may have restrictions on incidental shooting of feral swine. Firearm and archery equipment
are restricted to lawful arms and ammunition identified in the Game & Wildlife Code Sec. 2308:
http://www.pgc.state.pa.us/ pgc/cwp/view.asp?a=478&q=151077#2308. If you kill a feral swine please contact the nearest region office within 24
hours, so a sample can be collected for disease testing.