Most Popular NFL Team

Cleveland Browns Fans...eat your heart out!

The Steelers have a tradition of having a large fanbase, which has spread from Pittsburgh. In August 2008, ESPN.com ranked Steelers' fans as the best in the NFL, citing their "unbelievable" sellout streak of 299 consecutive games. While the team gained a large fan base nationally based on their success in the 1970s, many consider the collapse of the steel industry in Pittsburgh at the end of the 70's dynasty into the 1980s to be a large catalyst for the unusually high fan base in other cities, since many native Pittsburghers were forced to move elsewhere to find work, causing Western Pennsylvania to lose nearly half of its population. Examples of this have been shown when the Steelers are on the road, and the stadiums still having a sizable amount of Steeler fans; in particular, teams with usually low fan turnout at home that would otherwise require a local blackout on television usually end up selling out when hosting the Steelers due to Steeler fans buying up the tickets. The Cincinnati Bengals used to be perhaps the best example of this, as the team only sold out home games when the Steelers or Cleveland Browns were playing in Cincinnati, with the respective fans of the other teams buying up the tickets.
The Pittsburgh Steelers have sold out every home game since the 1972 season. In November 2007, the Steelers were ranked as the most popular local sports franchise out of the 122 teams in the NHL, NBA, MLB and NFL, by a study from Turnkey Sports. Another study ranked Pittsburgh as having the highest percentage of female fans of their local football team, ranking twice as high as the average city. An aspect of Steelers fandom, the Terrible Towel, is "arguably the best-known fan symbol of any major pro sports team". - http://wiki.answers.com/Q/Which_NFL_team_is_the_most_popular