List has been a 2011 model for Justice magazine. She has also appeared on the cover of the American Girl's 2009 Back to School issue. She appeared alongside Robert Pattinson in the movie Remember Me as a girl who bullies Pattinson's character's little sister. In 2010, List appeared in the Disney film The Sorcerer's Apprentice, and in Lifetime Movie Network's Secrets in the Walls, alongside Jeri Ryan and Kay Panabaker. List began modeling both by herself and with her brother Spencer. She has appeared in over four hundred commercial advertisements in various formats for various companies.
List starred in Diary of a Wimpy Kid: Rodrick Rules and Diary of a Wimpy Kid: Dog Days. She had a major role as Holly Hills, the crush of Greg. She currently stars as Emma Ross, the oldest of four children, on the Disney Channel series Jessie alongside Debby Ryan and her Diary of a Wimpy Kid co-star Karan Brar. Peyton is also working on a new film since June 2013 and will be rapping up production soon.