Are elk native to Pa? Well, the answer to this is yes, but. Yes, elk did inhabit Pennsylvania and actually thrived here. But the elk that live here now are not descended from the formerly native elk.
Long story short, as with many elk herds across the nation the Pa Elk Herd was hunted to extinction. There were attempts to keep them alive; however, those movements never gained traction and eventually the native elk simply vanished.
The elk you see running around PA now are actually relatives of those found in Yellowstone National Park as they were relocated from there starting around 1913.
For a complete history of PA’s Elk Herd please visit this article on the Pa Game Commission Website.