The Baltimore City Police Department, founded 1784 as a "Night City Watch" and day Constables system and later reorganized as a City Department in 1853, with a following reorganization under State of Maryland supervision in 1859, with appointments made by the Governor of Maryland after a disturbing period of civic and elections violence with riots in the later part of the decade, is the current primary law enforcement agency serving the citizens of the City of Baltimore.
Campus and building security for the city's public schools is provided by the Baltimore City Public Schools Police, established in the 1970s.

In the period of 2011–2015, 120 lawsuits were brought against Baltimore police for alleged brutality and misconduct.
 The Freddie Gray settlement of $6.4 million exceeds the combined total settlements of the 120 lawsuits, as state law caps such payments.

The Maryland Transportation Authority Police under the Maryland Department of Transportation, (originally established as the "Baltimore Harbor Tunnel Police" when opened in 1957) is the primary law enforcement agency on the Fort McHenry Tunnel Thruway (Interstate 95), the Baltimore Harbor Tunnel Thruway (Interstate 895), which go under the Northwest Branch of the Patapsco River, and Interstate 395, which has three ramp bridges crossing the Middle Branch of the Patapsco River which are under MdTA jurisdiction, the Baltimore-Washington International Airport, (BWI) and have limited concurrent jurisdiction with the Baltimore City Police Department under a "memorandum of understanding".

Law enforcement on the fleet of transit buses and transit rail systems serving Baltimore is the responsibility of the Maryland Transit Administration Police, which is part of the Maryland Transit Administration of the state Department of Transportation.
The MTA Police also share jurisdiction authority with the Baltimore City Police, governed by a memorandum of understanding.

As the enforcement arm of the Baltimore circuit and district court system, the Baltimore City Sheriff's Office, created by state constitutional amendment in 1844, is responsible for the security of city courthouses and property, service of court-ordered writs, protective and peace orders, warrants, tax levies, prisoner transportation and traffic enforcement.
Deputy Sheriffs are sworn law enforcement officials, with full arrest authority granted by the constitution of Maryland, the Maryland Police and Correctional Training Commission and the Sheriff of the City of Baltimore.

The United States Coast Guard, operating out of their shipyard and facility (since 1899) at Arundel Cove on Curtis Creek, (off Pennington Avenue extending to Hawkins Point Road/Fort Smallwood Road) in the Curtis Bay section of southern Baltimore City and adjacent northern Anne Arundel County.
The U.S.C.G. also operates and maintains a presence on Baltimore and Maryland waterways in the Patapsco River and Chesapeake Bay. "
Sector Baltimore" is responsible for commanding law enforcement and search & rescue units as well as aids to navigation.
The Baltimore City Police Department, founded 1784 as a "Night City Watch" and day Constables system and later reorganized as a City Department in 1853, with a following reorganization under State of Maryland supervision in 1859, with appointments made by the Governor of Maryland after a disturbing period of civic and elections violence with riots in the later part of the decade, is the current primary law enforcement agency serving the citizens of the City of Baltimore. Campus and building security for the city's public schools is provided by the Baltimore City Public Schools Police, established in the 1970s.
In the period of 2011–2015, 120 lawsuits were brought against Baltimore police for alleged brutality and misconduct.  The Freddie Gray settlement of $6.4 million exceeds the combined total settlements of the 120 lawsuits, as state law caps such payments.
The Maryland Transportation Authority Police under the Maryland Department of Transportation, (originally established as the "Baltimore Harbor Tunnel Police" when opened in 1957) is the primary law enforcement agency on the Fort McHenry Tunnel Thruway (Interstate 95), the Baltimore Harbor Tunnel Thruway (Interstate 895), which go under the Northwest Branch of the Patapsco River, and Interstate 395, which has three ramp bridges crossing the Middle Branch of the Patapsco River which are under MdTA jurisdiction, the Baltimore-Washington International Airport, (BWI) and have limited concurrent jurisdiction with the Baltimore City Police Department under a "memorandum of understanding".
Law enforcement on the fleet of transit buses and transit rail systems serving Baltimore is the responsibility of the Maryland Transit Administration Police, which is part of the Maryland Transit Administration of the state Department of Transportation. The MTA Police also share jurisdiction authority with the Baltimore City Police, governed by a memorandum of understanding.
As the enforcement arm of the Baltimore circuit and district court system, the Baltimore City Sheriff's Office, created by state constitutional amendment in 1844, is responsible for the security of city courthouses and property, service of court-ordered writs, protective and peace orders, warrants, tax levies, prisoner transportation and traffic enforcement. Deputy Sheriffs are sworn law enforcement officials, with full arrest authority granted by the constitution of Maryland, the Maryland Police and Correctional Training Commission and the Sheriff of the City of Baltimore.
The United States Coast Guard, operating out of their shipyard and facility (since 1899) at Arundel Cove on Curtis Creek, (off Pennington Avenue extending to Hawkins Point Road/Fort Smallwood Road) in the Curtis Bay section of southern Baltimore City and adjacent northern Anne Arundel County. The U.S.C.G. also operates and maintains a presence on Baltimore and Maryland waterways in the Patapsco River and Chesapeake Bay. "Sector Baltimore" is responsible for commanding law enforcement and search & rescue units as well as aids to navigation.
Baltimore