13. Radio One Inc.

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Founded by media mogul Cathy Hughes in 1980, Radio One Inc. is the nation’s largest radio broadcasting company targeting African American and urban listeners. The broadcasting powerhouse owns 53 stations in 16 markets including Atlanta, Baltimore, Dallas, Philadelphia, and Washington D.C. among others.

Additional Radio One properties include cable network TV One; digital enterprise Interactive One; urban lifestyle magazine GIANT; Tom Joyner Morning Show parent company REACH Media Inc.; and BlackAmericaWeb.com.