Hayleigh Jacobs was last seen near Kelly Avenue and Main Street in Half Moon Bay.
She is described as standing 5 feet 3 inches tall, weighs 110 pounds and has dark hair with blond streaks. She was last seen wearing a white knit sweater, dark gray leggings and knee-high black boots, according to the sheriff's office.
Anyone who sees Hayleigh has been asked to call 911.
