If you zoom in on Philly it seems like they position Grace Kelly in Center City and Noam Chomsky in North Philly somewhere. Noam Chomsky was actually born in North Philly (according to Wikipedia) - I can't tell what part of Philadelphia Grace Kelly should be associated with.
But then they don't have anyone in West Philly. I don't know if Will Smith is the most famous person associated with Philadelphia, but he is surely the famous person most associated with West Philadelphia.