Monica Arroyo, 16, was last seen in Lake Stevens, Washington on January 29, 2026. A prior missing-person report from 2023 described her as 5 feet 5 inches and 140 pounds, with brown eyes and black hair; that physical description may have changed but provides a reference point. Authorities believed she might be with a male juvenile and there was an indication she could have traveled to nearby Mount Vernon.

The Snohomish County Sheriff’s Office is handling the case and contact information for them and the National Center for Missing & Exploited Children has been circulated as investigators seek tips. Public reports offer few details about the events immediately before she went missing, and there have been no significant updates in the months following her disappearance.

If anyone in Lake Stevens or Mount Vernon saw Monica after January 29, 2026, or has information about who she may have been with, please contact the Snohomish County Sheriff’s Office or the National Center for Missing & Exploited Children.