For all those who live or are visiting the DC region you should check out the Northern Virginia Badminton Club:

The DC region needed a dedicated badminton club. Community centers and indoor basketball courts are good but it gets tough when they close for the holidays or you have to compete for space with other sports. I have been going to the new club for the past 2 weeks and it's great- courts, people, management-- all top notch! The only downside for me is that the club is a little far from where I live but playing badminton twice a week in a proper court at a convenient time of the day is all I can ask for now.