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. I'll write a posting sometime.
• Purcellville Chess Club - Located in Purcellville, VA. A really nice facility where there are lessons and occasional 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

Washington D.C.