Karen King is a school friend of Maryellen Larkin.
- Name: Karen King
- First Appearance: The One and Only
- Kathy King: Older sister
Karen is described as having a round, freckly face, and she is very cheerful. She is sympathetic towards Maryellen always getting hand-me-downs, as she herself gets hand-me-downs from her older sister, who is very hard on her clothes. She thinks that Karen Stohlman is lucky for only having a brother.
Though she lives in a different neighborhood than Maryellen, she is in her class and Girl Scout troop.