City of Baltimore
Baltimore City Code

§ 6-5. Change of number.

Whenever the number of any house or other building is changed by the Department of Transportation, the owner or occupant of that building shall completely remove or obliterate the old number within 10 days after receiving from the Department of Transportation a written notice reporting the changing of the number and notifying the owner or occupant of the new number that has been determined and fixed for the house or other building.