I do not know the most, but Cleveland and Pittsburgh have met 110 times. Both winning 55 games.
Richard "Doc" Walker played for two teams in the National Football league (NFL), He played for the Cincinnati Bengals and the Washington Redskins, He also played college football at UCLA.
The two NFL football teams played in Monday night football on September 21st 2009 was Miami Dolphins @ New York Jets.
No NFL teams went undefeated in 2009.
There are two NFL teams representing Pennsylvania. You have the Pittsburgh Steelers and the Philadelphia Eagles.
No
Joe Montana played for two different NFL teams over his long career. He originally played for San Francisco, where he played for 14 seasons. After that he played for the Kansas City team.
1938 Chicago Bears and 1978 49ers with 56
The only NFL team in Illinois is the Chicago Bears.
New York Giants New England Patriots
Colts and Saints.
The New York Giants and Dallas Cowboys are two of the most historic teams in the NFL. The teams also have a link. Tom Landry played for the New York Giants before he became the legendary head coach of the Dallas Cowboys.
Ohio, Pennsylvania, Texas and Missouri all have two teams each.