Top Major Radio Markets:

New York City, Los Angeles, Chicago, San Francisco, Dallas, Philadelphia, Washington DC, Houston, Miami, Detroit

Alphabetical Major Markets

Atlanta, Baltimore, Boston, Chicago, Cleveland, Dallas, Detroit Houston, Kansas City Las Vegas, Los Angeles, Miami, Minneapolis New York City, Philadelphia, Pittsburgh, Phoenix, Portland, Riverside Sacramento, San Antonio, San Diego San Francisco, San Jose, Seattle, St. Louis, Tampa, Washington DC

also see:

American Radio History
Biographies and Historical Reports of Radio Legends
History of Freeform Radio
The Rise of Alternative Radio
2009 Radio Industry Report