2: Players’ numbers – Ernie Banks (14) and Billy Williams (26) – retired by the Chicago Cubs, one of the oldest teams in Major League Baseball

4: Number of teams that have retired no numbers (Arizona, Colorado, Seattle and Toronto)

42: Only number retired by Major League Baseball (in 1997 in honor of Jackie Robinson)

15: Numbers retired by the New York Yankees, the most of any team

Source: www.historicbaseball.com