Before I moved, I hooped at Old Bowie (Outside) when the weather is right. Around this time of the year South Bowie Rec is nice. Open Gym on Tuesday and Friday nights from 7:30pm to 10:30pm I believe.
OFreshOne pretty much got the spots in DC.
Don't know if you're planning on going into MD.
But if you do there's a HOH in
Montgomery Mall:
7101 Democracy Blvd
Bethesda, MD 20817.
Also,
Prince Georges Plaza:
3500 E West Hwy
Hyattsvillle, MD 20782.