In 1997, the Seattle Mariners hit 264 home runs to set the MLB record.
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Barry Bonds holds the record for career home runs with 762 and the mark for most homers in a season with 73.
Coors field
As of June 2014 Barry Bonds holds the record for most regular season homeruns. The record is 73 which beat Mark McGwire's record.
David Ortiz set the single-season record for most home runs by a Boston Red Sox player in 2006. He hit 54 home runs that year, which was the most in the American League.
The record is still held by Barry Bonds.