The official seating capacity for the racetrack is 12,896, but that doesn't take into account the over 100,000 spectators that pile into the infield or have standing room-only tickets. The 1873 Preakness had an estimated attendance of 12,000, and it wasn't until 1999 that the race reached a crowd of 100,000. Eighteen years later at the 2017 Preakness Stakes, Pimlico hosted 140,237 fans, which remains the race's all-time record.