City of Baltimore
Baltimore City Code

§ 9-6. License required.

No business in a Residential Zoning District, Office-Residential Zoning District, or C-1, C-1-E, C-1-VC, C-2, or C-3 Commercial Zoning District may be open to the public at any time between the hours of midnight and 5 a.m. without having first obtained a late-night operations license under this subtitle.