Baltimore and washinton dc's current state is a disgrace. I know some of you will disagree, but while we have a "supercharger" it is single temporary charger in a very tight and confusing parking space and is frequently full due to showroom cars. It also does not charge at full speed, so it is fairly useless if you need to really use a supercharger as a supercharger, vs just a somewhat quick charger. It is in an ideal location though, and the fact it wasn't resolved over a year ago with a REAL full 6+ bay supercharger boggles my mind.
What could/should have been superchargers in tysons is not, and the spaces are all now taken up by the store slow charging vehicles all day. You have to call ahead and see if they mind if you use a charger and they don't offer anything at the tesla service center. It would also be a near ideal location for people traveling through the corridor if montgomery mall just cant work.
Baltimore has nothing at all. Driving up to baltimore then back while visiting clients etc is an exercise in sweating out planning my drive very, very carefully. There are third party chargers, but we have evgo, chargepoint, ge and another one I cant remember so it isn't effective to subscribe to just one, though and I am close to cracking and buying a chademo charger when I thought I should be fine.
This area has a huge number of tesla vehicles.