Jonathan Neil Larson hasn't been seen since his father dropped him off near the North Bend Public Library at 3 p.m. that day.
He is described as a white male with red hair and brown eyes, standing about 5 feet 7 inches and weighing about 220 pounds. He was last seen wearing a white T-shirt and blue silk pants. He was carrying a black backpack and brown paper bag with clothing inside.
Larson has a history of mental health issues and may be off his antipsychotic medications, Snoqualmie police said.
Anyone with information about Larson or his whereabouts is asked to contact 425-837-3200 immediately.