The Houston Astros have retired a lot of jersey numbers, for a team that has only been in existence since 1962. Regard: Number of retired numbers, by team, with year they were established in parentheses (not counting Jackie Robinson, whose number was retired across MLB. Now do the same for Roberto Clemente, Manfred you sack of crap).
Pittsburgh Pirates: 9 (1882)
Cleveland Indians: 9 (1901)*
Houston Astros: 9 (1962)
Minnesota Twins: 8 (1961)
Philadelphia Phillies: 7 (1883)
Baltimore Orioles: 6 (1901)
Oakland Athletics: 6 (1901)*
Chicago Cubs: 6 (1903)
Washington Nationals: 5 (1969)*
Texas Rangers: 5 (1972)
Kansas City Royals: 3 (1969)
Arizona Diamondbacks: 2 (1998)
Colorado Rockies: 1 (1993)
Miami Marlins: 0 (1993)
*St.