On August 17, 2005 — 2005 – St. Louis announces the franchise has broken its single-season attendance record of 3.43 million set in 1989. The first-place Cardinals have sold 3.45 million tickets for the team’s farewell season at 40-year-old Busch Stadium.

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Source:
Baseball Reference August 17
National Pastime
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game