- Is commonly confused as being brother of actor James Marsden. Although the two are not related, they are actually good friends, and their respective wives have been friends since they were six years old.
- Best man at his wedding was best friend and former Boy Meets World (1993) star Will Friedle.
- He graduated from high school at age 16.
- His father, Myles Marsden founded the State Ballet of Rhode Island. He also founded the Miles Marsden Dance Studio.
- Was best friends with Jonathan Brandis.
- Former child stars, such as Scott Curtis from Aaron's Way (1988) and Danica McKellar from The Wonder Years (1988), attended his wedding.
- Hobbies are ice-skating, rollerblading, drawing, swimming, and collecting Disney movies.
- The officiant at his wedding was former Charles in Charge (1984) star Alexander Polinsky.
- His wife, Christy Marsden, gave birth to a baby boy, named Clark Otis Marsden, on February 17, 2010, who was 3 months premature.
- His mother, Linda Marsden, is a former model.
- Was born on the same day and year as his Static Shock (2000) co-star, Danica McKellar: January 3, 1975.
- Provided the narration for advertisements on Toon Disney, sometimes calling himself J-Mars.
- He has 3 older half-siblings from his father's first marriage to dancer, Ivanka Herci Munitic; Ana Marsden Fox, Rick Marsden, and Mark Marsden.
- Garrett Miller, the character he voiced on Extreme Ghostbusters (1997), was originally called Lucas in earlier drafts of the series. The character he played was the only Ghostbuster character not to have an action figure.
- His parents are Myles Marsden and Linda (née Williams) Marsden.
- Attended D. Russell Parks Junior High School in Fullerton, California, in Orange County.
- He went to Laguna Road Elementary School in Fullerton, California.
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