B.W.
I don't know the area very well. My children go to the Montessori School of Alexandria. It is an exceptional school! They don't advertise because they don't need to in order to keep running. I would be happy to talk to you more about it if you want. If it is too far out of your way I do know the DC Metro Area Parents magazine that comes out every couple months usually has a full page of Montessori schools listed.