K Street is a major thoroughfare in the United States capital of Washington, D.C. known as a center for numerous think tanks, lobbyists, and advocacy groups. In political discourse, "K Street" has become a metonym for Washington's lobbying industry since many lobbying firms were traditionally located on the section in Northwest Washington which passes from Georgetown through a portion of downtown D.C. Since the late 1980s, however, many of the largest lobbying firms have moved out; , only one of the top-20 lobbying firms has a K Street address.