b. St. Louis Browns
There have been lots of comings and goings in Baltimore sports history.
On Mar. 28, 1984, the Colts snuck out of town under cover of darkness to move the entire franchise to Indianapolis. Football eventually returned to Baltimore when the Ravens relocated from Cleveland.
The New York Yankees also got their start in Baltimore. They only played there for two season in 1901 and 1902 before jumping ship.