The NFC is in more big markets than the AFC
> CBS is the number-one network in terms of total prime-time viewers.
>
> Fox likely draws more viewers to it's NFL games than ABC,
> CBS or ESPN. My guess is that Fox is making this claim based
> on the total number of viewers to all of the network's NFL
> games. A network that feeds (to most affiliates) 26
> regular-season NFL games to it's stations (Fox and CBS) has
> an advantage over a network that feeds just one game a week
> (ABC and ESPN), even if that one game is in prime-time.
...and the AFC is in more medium markets.
Of the 12 teams in the Top 11 TV markets (#10 Houston and #11 Detroit are virtually tied), 8 are in the NFC (NY Giants, Chicago, Philly, SF, Dallas, Washington, Atlanta, Detroit). Only 4 are in the AFC (NY Jets, New England, Oakland, Houston), with only the Texans and Patriots not sharing their potential audience with an NFC team.
Of the NFL teams in markets #30 and below, the NFC is only in #43 (probably somewhere around #75 now after Katrina) New Orleans and #69 Green Bay (with most of the Packers' potential audience in #33 Milwaukee), while the AFC is in #30 Nashville, #31 KC, #34 Cincinnati, #49 Buffalo, and #52 Jacksonville.
Probably explains why Fox leads CBS in NFL ratings and why CBS led NBC years ago.