Not sure exactly as values change from time to time, but the Miami Dolphins and New England Patriots are two of the most valuable based on the fact that they own their own stadiums as well. Regardless of what sport you're talking about, the value of a franchise increases dramatically when they own their own stadium as opposed to leasing it from the city they play in.
If you are asking financial worth then you answer is the Dallas Cowboys.
NFL team owners are ridiculously wealthy. Each team is worth around $500,000,000+, so NFL team owners are probably worth around $400,000,000,000.
Who was the most penalized nfl team in 2013
Most cities of the world do not have a NFL team
The team with the most draft picks in the NFL is the Philadelphia Eagles.
jacksonville
The rams
raiders
The Cowboys
Patriots
The Baltimore Ravens is the NFL team with the fewest white players. The NFL team with the most white players is the New England Patriots.
The Tampa Bay Buccaneers hold the title for being the NFL team with the most losses in history.