Yes, The Dorsey Hall Dr. address is a place where you can send mail to for missionaries in the Maryland Baltimore Mission. They get it at the office and than the office elders or sisters forward it through the mail to the missionaries apartment. Packages are also welcomed with open arms. I always found it better to have my parents write me through the office because it always got to me. Instead of getting transfered and having them sending it to an apartment that I just left and getting the mail weeks later because of that. Well maryland is a great place to serve. The church is not strong in all the state but the members really make you feel welcomed. Most of the housing there for missionaries are apartment that only the missionary and his companion live at, but there are a few places where they have multi missionaries apartments or missionaries living in members basement. All in all have no worries Maryland Is the greatest mission for anyone to serve in. Your missionary is probably having the time of his/her life!