roland park is very very small and it's definitely the richest in baltimore city yes, in maryland? I doubt it. looking at the concentration of schools, it would have to montgomery or somewhere along the potomac.
I could be wrong but this neighborhood is definitely one of the worst for a college campus, that being said I don't think it should affect a decision for math phd, zelditch minicozzi and a few others are 2nd to none in their fields.