Are you looking for a theater or a production you can be a part of?
Here is a list of pages all about theater as well as listings of theater companies and various other articles for actors and those starting out in acting. There are theaters in just about every city or town and most of them put on productions that need actors.
For actors just starting out, community theaters may be a good place to go to get some needed experience as well as some stuff to use on your acting resume. The key to becoming a great actor is to keep honing your craft and theater is a great way to do it.
US theater companies
Are you looking for a theater company? Check the following pages: