Up here in Mass we have very limited selection but as far as objects of interest here is a small list of snakes Ive caught in MD.
Coastal Plains milks
Eastern Milks
Intergrade Milks
Eastern Kings
Mole kings
Black rats
Corns
timber rattlers
I think we have like 2-3 of those up here but MD you can find some really nice stuff! BUT of course you gotta know where to look! No substitute for field time!