Major league championship numbers I rolled back your edits on List of U S cities by number of professional sports championships for the following reasons The Arizona Cardinals started as the Chicago Cardinals and won two NFL championships there The San Francisco Giants won 5 World Series when they were still the New York Giants and The New York Nets were an ABA team not an NBA team This page doesn t count the ABA as a major league since the leagues didn t truly merge the way the AFL and NFL did only four of the ABA s 12 teams joined the NBA I ll put back the correct numbers for the New York teams that s 34 World Series 2 NBA Championships and 9 NFL Championships Thanks