He has two sisters: Jennifer - age 24 and Elizabeth - age 12, as at 2004. Jennifer lives in Studio City, California and Elizabeth in Manhattan, Kansas.

Attended Oklahoma State University

Son Jack was born on February 1, 2001, in Los Angeles weighing 7 lbs., 14 oz.

In 1991, while vacationing with his family in Hawaii, he met actor Kirk Cameron and his actress sister Candace Cameron Bure; the Camerons invited Marsden to visit in L.A. and thus began his career.

Lost out to Edward Norton for a role in Primal Fear (1996).

Turned down the lead role in 54 (1998). Ryan Phillippe later got the role.

Graduated from Putnam City North High School (located in Oklahoma City) class of 1991.

Joined the Delta Tau Delta fraternity while at Oklahoma State.

His father is a Distinguished Professor of Animal Sciences & Industry at Kansas State University.

He wore lifts for most of his scenes in the X-Men movies, because his character Cyclops is supposed to be 6' 3" compared to a 5' 3" Wolverine. In actuality, Marsden is under 6 feet tall, slightly shorter than Famke Janssen (as his love interest, (Jean Grey) and approximately 4 inches inches shorter than Hugh Jackman (who played Wolverine).

An accomplished singer.

Daughter, Mary James Marsden, born on 10 August 2005.

Is the only actor from the X-Men films who not only stayed on in the third film, after the departure of director Bryan Singer, but also worked with Singer on his subsequent project, Superman Returns (2006).

Has worked 4 times with actress Rebecca Romijn: "X-Men" (2000), "X2" (2003), "The Alibi" (2006) and "X-Men: The Last Stand" (2006).

Also has two brothers, Jeff and Robbie.