Johnny Bench was a player for the Cincinnati Reds, most notable for scoring the longest home run in Kauffman Stadium. His record, set in 1973, was 480 feet, and the pitcher was Bill Singer.
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.
The longest home run was made by Ryan Howard. 536 ft.
Reggie Jackson hit career home run number 500 on September 17, 1984 off Royals pitcher Bud Black, in the bottom of the 7th inning in California.
Reggie Jackson
Ronnie Green of the KC Royals hit the longest home run at Fenway Park in 1987
The longest home run of 2009 belongs to Waldemar Balentien of the Cincinnati Reds. It was measured at 495 ft.
Justin Upton
Reggie Jackson hit career home run number 400 on August 11, 1980, off White Sox pitcher Britt Burns, in the bottom of the 4th inning at Yankees Stadium.
507 feet by prince fielder
525 feet
760 ft.
603 ft