Seattle's Intiman Theatre closed in 2011 due to financial problems but is scheduled to reopen in 2012. its sort of equivalent to the Playhouse, but government funding doesn't play much of a part in the USA, plus they also have another group doing theatre at the Fith Avenue.
Note: if you've never seen something at the Fifth Avenue, do so, its 1920's movie house interior puts the Oprpheum to shame:
http://www.dazzlingplaces.com/Images/Seattle/FifthAvenueTheater/FifthAvenueTheater.jpg