Industry

Washington DC's primary industry after the federal government is tourism. Other important industries include trade associations, as Washington, DC is home to more associations than any other U.S. city; law; higher education; medicine/medical research; government-related research and publishing. Washington, DC metropolitan area is also world headquarters for corporations such as USAirways, Marriott, Amtrak, Gannett News, Mobil Oil, MCI Telecommunications and the International Monetary Fund.