I'll fill this up as I have time.

Loudoun County

• Leesburg Chess Club - Now officially disbanded.
• Ashburn Chess Club - Excellent club that started with a bang.
• Purcellville Chess Club - Located in Purcellville, VA. A really nice facility where there are lessons and occasional tournaments.
• Sterling Chess - Focuses on tournaments

Elsewhere in VA

• Arlington Chess Club - Located somewhat in Northern Virginia.
• Virginia Chess Clubs; including Kingstowne Chess Club, several chess clubs in Fairfax, Richmond Chess Club, and a bunch more (including schools)
• Reston Chess Club Meets at the Reston Community Center
• Spotsy Chess Club - holds the best scholastic chess tournaments in the state. Brian Dickerson runs this show with class.

Washington D.C.