At age six, Jeremy was the youngest child in Kentucky to be accepted into the state's Gifted Arts program
Auditioned for the role of Bobby Garfield in Hearts in Atlantis (2001)
Has a twin named Jessica Sumpter and a younger sister, Gigi Sumpter.
Raised in Kentucky until he was 11
Was named IMTA's Pre-Teen Male Model of the Year in 2000
His younger sister appeared with him in his "ER" (1994) episode.
His favorite book is "The Giver".
His favorites foods are spaghetti and chili
He has a dog named Bear.
During the filming of Peter Pan (2003), he grew 8 inches (from 5' to 5' 8") and the size of the window had to be enlarged 4 times to enable him to "fly" into the house without bumping his head. The boy who "never grew up" did so in reality.
Resides in Los Angeles, California 
Twin brother of actress Jessica Sumpter
Brother of actress Gigi Sumpter
He stated at the end of Peter Pan (2003) that he did 98% of the stunts shown in the movie. He said he was unable to do "like two or three of them because they were too dangerous".
Can be seen on the DVD of _Peter Pan_ (2003) , saying he is spoofing _Moulin Rouge_ (2001) as he sits on a swing singing.
In 11th grade his favorite subject is history and his least favorite is math
Currently, his top sports are surfing, swimming, golf, and basketball. He also enjoys football, baseball, snowboarding, tennis, soccer, hiking, and roller blading.