There are six major theatres in Philadelphia. These theatres tend to do more original theatre, with local casting. Very fun stuff.
Walnut Street Theatre – http://www.wstonline.org
Wilma Theatre – http://www.wilmatheater.org
The Arden Theatre – http://www.ardentheatre.org
Prince Music Theatre – http://princemusictheater.org
Philadelphia Theatre Co – http://www.philadelphiatheatrecompany.org
People’s Light & Theatre – http://www.peopleslight.org
These theatres tend to host travelling theatre company’s (like the recent “Wicked” show at the Academy of Music)
The Forrest Theatre – http://www.forrest-theatre.com
The Academy of Music – http://www.academyofmusic.org
The Mann Center – http://www.manncenter.org
The Kimmel Center – http://www.rpac.org
Absolutely great small theatre. These houses put on very top-notch shows in intimate settings
Montgomery Theatre : http://www.montgomerytheater.org
Interact Theatre Company : http://www.interacttheatre.org/