The number of licensed AM and FM radio stations across the U.S. as of Aug. 20, the 95th anniversary of the first broadcast by a federally licensed station -- 8MK in Detroit, now WJJ -- in 1920. That October, Pittsburgh's KDKA began broadcasting, and by 1922 the nation had 30 stations. A year later, it had 556.
Source: Profile America, U.S. Census Bureau
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