There's a play-by-post subforum right here, where you can join in on a game via posting messages; you can get a chance for some in-depth rp in exchange for a really slow game pace.
Also, there are groups that play online, over Skype or similar products, and there are periodically sign-up threads that show up.
Also, investigate if there's a local game shop in your city; most cities of reasonable size have one. They usually have a board somewhere announcing games and players looking for games.