Phillies first baseman Ryan Howard owns that record, and he also owns the the mark for 2nd, 3rd, and 4th on the distance chart at Citizens Bank Park for that matter: Longest: 505-foot poke over the brick batter's eye against Cincinnati's Aaron Harang on June 27, 2007. 2nd longest: 496-foot shot onto "Memory Lane" in dead center off of Florida Marlins Sergio Mitre April 23, 2006. 3rd Longest: 479-ft shot off of Yankees Mike Mussina (grand slam) to the 3rd upper deck in right, June 20, 2006. 4th longest (and most recent): 475-ft towering blast against Washington Nationals Shairon Martis (grand slam) to the 3rd upper deck in right, May 30, 2009.
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Citizens Bank Park
Ted William's longest home run in Fenway Park was 502 feet, but I don't know if that was his longest home run ever.
Ronnie Green of the KC Royals hit the longest home run at Fenway Park in 1987
Freddy Galvis debuted on April 5, 2012, playing for the Philadelphia Phillies at Citizens Bank Park; he played his final game on September 29, 2013, playing for the Philadelphia Phillies at Citizens Bank Park.
Cameron Rupp debuted on September 10, 2013, playing for the Philadelphia Phillies at Citizens Bank Park; he played his final game on September 28, 2013, playing for the Philadelphia Phillies at Citizens Bank Park.