Authorities say Emillie Miller left her home in Greeley Hill on Tuesday. She was last seen in the Manteca area.
The teen is 5 foot 3 inches and weighs around 130 pounds. She has brown eyes and brown hair with blonde highlights.
Officials say Emillie currently has a broken nose and two black eyes from a recent car accident.
Anyone with information is asked to call the Mariposa County Sheriff's Office at 209-966-3615.