The Washington Metropolitan Area is the ninth-largest television media market in the nation, with two million homes, approximately 2% of the country's population. Several media companies and cable television channels have their headquarters in the area, including C-SPAN; Black Entertainment Television (BET); Radio One; the National Geographic Channel; Smithsonian Networks; National Public Radio (NPR); Travel Channel (in Chevy Chase, Maryland); Discovery Communications (in Silver Spring, Maryland); and the Public Broadcasting Service (PBS) (in Arlington, Virginia). The headquarters of Voice of America, the U.S. government's international news service, is near the Capitol in Southwest Washington.