Here are the top 100 Philly area firms on the 2012 Inc. 5000. The top 3 are Leadnomics (Philadelphia), sales lead information, #26 nationwide; Accolade (Plymouth Meeting), health care assistance services, #33; and WebiMax (Mount Laurel), SEO/SEM services, #37.
I like to point out that some of the highest ranked companies are starting from a very small base, and that revenue growth by itself is often not the best indicator of future success. There are presumably others that could qualify for this list but prefer to keep their revenue figures confidential. Also, this year Inc. seems to have a (free) signup requirement if you are to have access to all the information.