The accident happened about 4:45 p.m. Monday along northbound 92nd Avenue W., Snohomish County sheriff's spokeswoman Shari Ireton said.
The passenger side mirror of a passing truck struck the boy, she said. He was taken to a local hospital and later released.
The impact broke off the truck's mirror, which police collected, Ireton said.
Detectives also reviewed footage of the area from a nearby surveillance camera.
They believe the truck was a Ford F150 pickup in a light color, maybe gold.
Anyone with information should call police at 425-388-3845.
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