It was also Edgar Allan Poe's home town. The First Doctor, Ian Chesterton and Barbara Wright once encountered Poe there, near the end of his life, (PROSE: The True and Indisputable Facts in the Matter of the Ram's Skull) as did the Seventh Doctor and Ace (PROSE: The Algebra of Ice) and the Eighth Doctor. (AUDIO: Nevermore)
Some of its inhabitants, aside from Peri, were her mother Janine Foster, her late father Paul Brown, Anthony, Kathy and Nathaniel Chambers, Daniel Woods, Lt Doyle, and Natalie Hamilton. (AUDIO: The Reaping)
Though it's possible that a real world location doesn't exist in the same geographic space in the Doctor Who universe, such cases are few and far between. Thus, the map at right is probably a good indicator of the DWU location of Baltimore.