This is a list of venues used for professional baseball in Baltimore, Maryland. The information is a synthesis of the information contained in the references listed.
Flat Rock aka Druid Hill Park
Home of: Excelsior local club (1858-1859)
Location: Eutaw Place (southwest, third base); Flat Rocks (southeast, right field); between the Rogers and Brooks farms; on the former site of Mount Vernon Cemetery.
Location: North Avenue (north, third base / left field); Ross Road (now Druid Hill Avenue) (southwest, first base); eventual Gold Street (southeast, right field); just west of the site of Madison Avenue Grounds, and a few short blocks northeast of the site of Newington Park
Location: Madison Avenue (southwest, home base); Boundary Avenue (later North Avenue) (north, beyond third base / left field); Linden Avenue (northeast, center field); old road approximating Robert Street (southeast, right field)
Location: Pennsylvania Avenue (northeast); Gold Street (southeast); Calhoun Street (southwest); Baker Street (northwest) – a few blocks west-southwest of the Madison Street ballpark – diamond position unknown
Location: Sixth Street / Huntingdon Avenue (later 25th Street) (north, right field); York Road (later Greenmount Avenue) (east, first base); Barclay Street (west, right field); eventual 24th Street (south, left field)
Location: 10th Street (later 29th) (north, home plate); York Road (later Greenmount) (east, third base, left field); future 9th Street (later 28th) (south, center field); future Barclay Street (west, first base, right field) – three blocks north of previous site
Home of: Baltimore Orioles – American Association (mid-1891) and NL (1892–1899)
Location: 25th Street (north, home plate / third base); Barclay Street (east, left field); approximate line of Hunter Street (west, first base); approximate line of 23rd Street (south, right field) – just west of 1883–1889 site
Location: Same as 1890–1891 site – 10th Street (later 29th) (north, home plate); York Road (later Greenmount) (east, third base); 9th Street (later 28th) (south, center field); Barclay (west, first base)
Location: 10th Street (later 29th) (south, first base); York Road (later Greenmount) (east, right field); 11th Street (later 30th) (north, left field); Vineyard Lane (originally Gilmore Lane) (northwest, third base) – just across the street to the north from previous Oriole Park; Barclay now cuts through the property.
Location: Westport neighborhood – Annapolis Road (State Highway 648) (west, home plate); Clare Street, then Waterview Avenue (to the south, right field); Patapsco River (to the east, center field); Ridgleys Cove (to the north, left field)
Location: Bush Street and a branch of Ridgleys Cove (northeast, third base); Annapolis Road (State Highway 648) (northwest, first base); Ridgleys Cove (south and southeast, outfield); half a mile or so north of Westport Park
Location: 333 West Camden Street – Camden Street (north, left field); Eutaw Street (east, right field); Briscoe and Houser Streets (south, first base); Conway Street (west, third base)