The mayor of Baltimore is the head of the executive branch of the government of the City of Baltimore, Maryland. The Mayor has the duty to enforce city laws, and the power to either approve or veto bills, ordinances, or resolutions passed by the unicameral Baltimore City Council. In addition, the Mayor oversees all city services, public property, police and fire protection, most public agencies, and shares with the Governor of Maryland, responsibilities for the public school system within the city limits. As of May 2, 2019, the Office of the mayor of the City of Baltimore has changed hands 62 times with 53 different individuals in assuming office in the 220 years of city government, 1797–2017. The Office of the Mayor is located in the historic Baltimore City Hall located at 100 Holliday Street in downtown Baltimore. History James Calhoun was first elected in 1794 under the old Baltimore Town government with a group of town commissioners, and continued as the new first mayor under the new City Charter in 1796–97, when the city was incorporated as the "City of Baltimore" (occasionally entitled officially as the "Mayor and City Council of Baltimore") under the authority of the General Assembly of Maryland which had originally authorized the port in 1706 and the creation in 1729 and laying out of a town in early 1730. Calhoun continued to serve for another seven years until 1804. Serving as the "county seat" since finagling a scheme to move the courthouse, replacing old Joppa in 1767 of surrounding Baltimore County which had been "erected" (authorized) in 1659 as the fifth county designated in the Province and first county in northern Maryland. The city was separated from the adjacent County by the provisions of the adoption of the new second Maryland Constitution of 1851 and became an independent city with the same status as the other 22 (later 23) counties of Maryland. Then the county seat for Baltimore County was moved after an election/referendum to Towsontown (later Towson, Maryland), a few miles north of Baltimore with the building there of its first Courthouse structure three years later with surrounding square of landscaped grassy lawns between Allegheny, Pennsylvania and Chesapeake Streets in 1854. Six individuals are credited with multiple, non-consecutive returns to the office after completing an initial term, and are counted as separate mayoralties. These are: Edward Johnson (twice), John Montgomery, Ferdinand C. Latrobe (elected