I live in PA. Technically, you can open carry without a license or permit or anything, but a concealed carry requires a license.
As a practical matter, while open carry is legal, it’s often not tolerated very well and you can expect to be harassed by law enforcement for doing it. On the other hand, we don’t really have a “concealed carry” license. It’s technically a “license to carry firearms” and while you can carry it concealed (and can also carry it loaded inside your car, which you can’t do with the LTCF) you aren’t required to carry it concealed. A lot of folks have the attitude that the LTCF allows you to do pretty much whatever you want to do.
West Virginia allows open carry but requires a permit for concealed carry, but like PA, you can expect to be harassed quite a bit if you open carry.
So while both are permitted from a strictly legal point of view, it is much more practical in PA and WV to carry concealed.
IIRC MD technically allows open and concealed carry with no distinction between the two, but they make it almost impossible to get a permit to do so.