I have some German forefathers and it looks like you do too.
A Census map showing ancestry by county paints not only Western Pa. but pretty much the entire commonwealth blue. Luzerne (Polish) and Lackawana (Irish) seem to be the renegades. You can click on the map for a better look.
The map may use census data from 2000, but I doubt we’ve experienced huge population shifts since then.
You can see a breakdown of diversity within counties in the Racial Dot Map.