Check out PPA Hoops. They have leagues for kids as young as K. We are in Bethesda also and my son plays on a local team with local practices and weekly games.

MADE, MBA, and Blue Chips are other potential options. If your kid is pretty good (doesn't have to be amazing, just good), playing up on the third grade teams is an option for the spring. Rosters are depleted for most teams in the spring at the younger ages, so a good 2nd grader can compete for sure.

Title says most of it! My 2nd grader wants to keep playing basketball this spring. KOA and Skills & scrimmages seem to start in 3rd. What else is out there? We are in the Bethesda area.