Which pro sports teams have the most retired numbers?

All 32 NFL team's retired jersey numbers - ESPN - NFL Nation- ESPN

How many sports teams can you name that don't end in S? - Quora

How many uniform numbers are retired by the New England Patriots?

List of National Football League retired numbers - Wikipedia

Will LeBron James change his number on Lakers? NBA retires Bill Russell's No. 6 jersey - AS USA

What is the most popular professional sports team in the US? - AS USA

Bill Russell's No. 6 jersey to be retired throughout NBA

Every MLB team's retired numbers

Jude Bellingham: Birmingham retire number 22 shirt in recognition of youngster, Football News