Thanks to everyone for the input. FYI - my primary reason for asking is because I knew a good wrestler from there - Tyler Erdman. He and his friend came and stayed with us for a week when I was living in WA. They came to our HS summer practice and showed a lot of cool technique and also got on the mat with some of our guys. It was a really fun visit.The entire SW corner of Northumberland County -- nearly everything between Sunbury and Millersville, and from the Susquehanna River almost all the way to Shamokin. Or for people less familiar with Central PA: about 45 min straight north of Harrisburg, on the same side of the river.
It's a forgotten corner of PA. Middle of nowhere rural -- the 3 biggest "towns" (Trevorton, Herndon, Dalmatia) probably combine for under 2,500 people. Very few people even pass thru there unless visiting family or a HS event -- the roads are far slower than across the river (N/S) or Rt. 61 (E/W), and sadly it's kinda run down, not particularly scenic (with one exception -- Rt. 147 southbound near Dalmatia has a nice downhill view of the river).
Also the roads are really bad in the winter, not that I've ever, say, scared the snot out of my wife on Rt. 147 while unable to go above 30, just to avoid mall traffic on the day after Christmas.
The HS is on Rt. 225 just south of the split from Rt. 147, near Herndon. It's a pretty big district -- I had a friend from there who lived 30 min from the HS (driving, not bus).
Unfortunately, I learned a few years ago that Tyler took his own life. I have no idea what happened, but I was really upset to hear the news. 😢