Baltimore is the most populous city in the U.S. state of Maryland, as well as the 30th most populous city in the United States, with an estimated population of 593,490 in 2019. Baltimore is the largest independent city in the country and was designated as such by the Constitution of Maryland in 1851. The flag of the city of Baltimore features the “Battle Monument”, which is also the central motif on the city’s seal. The monument was constructed in the former colonial era Courthouse Square along North Calvert Street, between East Lexington Street to the north and East Fayette Street to the south, after the second Baltimore City and County Courthouse was constructed on a site farther west across Calvert Street in 1805. Full HD.