Radio market? That went obsolete with the advent of satellite radio. Besides several of those markets listed ahead of us aren't NFL cities. LA, Puerto Rico, etc
Do I have to hit you with the stupid stick? The Arbritron ratings system the the one all broadcast media, and companies use for their marketing dollar usage, many companies will not advertise in a market below 25, it's just how marketing works. The fact that those are a break down according the radio is irrelevant because the Arbritron ranking is based solely on population, thus the only true showing of market size.
Read the freaking rankings and maybe you will learn a thing.
if you want to make another dumb comment though be my guest.