Santee state park not too far from Charleston has a lot of pawpaws growing near the lakefront visible from the hiking trails.
It is a good long hike to the spots where they are though.
They seem to be the dominant understory tree in some spots, probably several acres in total of thriving mature trees.
Worth a look next Summer, maybe you can beat the raccoons to some fruit or at least pocket a few seeds....
I haven't seen pawpaws anywhere else in the South Carolina lowcountry. That far South you will probably need to grow them in heavy shade similar to the areas they grow in at the State park.
I was shocked to see a forest of pawpaws beneath the taller trees, it was like being in Kentucky or Tennessee ....