I think the bulk of Philly commuters live as far west as Montgomery County and into Reading, or as far north as the Lehigh Valley (Allentown-Bethlehem-Easton). Farther west and you're in PA Dutch/Amish country and farther north and you're in the mountains. I don't commute there myself, but I have friends that do in both those directions. Driving in from the west, and taking the train in from the north. There's lots of urban, suburban, and rural places all long there for whatever meets your fancy.