place name

[Gillianglls]

what does the MD stand for in Baltimore MD?

[Jules001]

All US States have a two letter(maybe more not absolutely sure) identification code so as Baltimore is in Maryland , the MD stands for Maryland

[brachiopod]

Some of the old state abbreviations two, three or more letters, but the official 2-letter US postal Service abbreviatons have now become the norm.

See;

http://www.acronymfinder.com/stateabbreviations.asp

I remember wondering what these letters were, and then finding out that they were state abbreviations back in the (*cough*) seventies - after listening to Lou Reed's 'Walk On The Wild Side' ("Holy came from Miami, FLA....")