If a girl was in Mt Laurel or Camden, would you search the Philadelphia board or on the NJ ad board? Just would like to know

If it was a local girl, then check the state that she is hosting in.  However if she is a traveling girl then she could post in Pennsylvania but have dates in Mt. Laurel.  Although you were just saying that it is a case in point, she will never advertise for Camden on this board.

If you put an ad in both that would cover all the bases? It's not to far from Philly to Mt. Laurel and I have done it on occasion myself.

both always check both

Same here. I even check dc boards. There are times where I see posts on DC boards I would like to meet and convince them to visit Philly. Especially those that tour they can stop by philly/snj before they head up to NY.