- Says that he is so constantly mistaken for actor Ethan Hawke that he signs autographs as "Ethan Hawke" to those fans who mistake him (and apparently the same thing happens to Ethan Hawke, who also signs autographs as "Mark McGrath").
- Lead singer for the rock band Sugar Ray.
- Has a degree in communications from the University of Southern California.
- Owns a Cadillac Coupe DeVille from 1968, which is the year he was born.
- Became engaged to aesthetician Carin Kingsland McGrath on New Year's Eve 2009, after 16 years of on-and-off dating. On April 29, 2010, they became parents of twins, Lydon Edward and Hartley Grace McGrath.
- Graduated from Corona Del Mar High School in 1986,and was on the track and basketball teams.
- Has 13 tattoos.
- Co-host, with Melissa Todd, of an infomercial for the "Buzz Box" music collection. (2007)
- Was 12 when his parents got divorced.
- Sister, Tracy McGrath and Tracy Lee McGrath, is two years older than him.
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