Three teams in the NFL have won 600 or more games thru week 6 of the 2013 NFL season. The teams are:
The Chicago Bears, 726 regular season wins
The Green Bay Packers, 693 regular season wins
The New York Giants, 654 regular season wins
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The Pittsburgh Steelers did in 2005.
Chiefs, Packers, Giants, Steelers
45 had won the most championship football games
Only the 2007 New England Patriots won all 16 regular season games. The 1972 Miami Dolphins also won all of their regular season games, but the regular season was 14 games at the time.
Pittsburgh steelers