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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 a population of 602,495 in 2018 and also the largest such independent city in the country. Baltimore was established by the Constitution of Maryland as an independent city in 1729. As of 2017, the population of the Baltimore metropolitan area was estimated to be just under 2.802 million, making it the 21st largest metropolitan area in the country. Baltimore is located about 40 miles (64 km) northeast of Washington, D.C., making it a principal city in the Washington-Baltimore combined statistical area (CSA), the fourth-largest CSA in the nation, with a calculated 2018 population of 9,797,063.