Peoria Police Seek Help Locating Missing Man

Authorities are asking the public for information regarding the disappearance of 38-year-old Mark T. Vallianatos.

Updated on Oct. 24, 2026 in Autism

Peoria Police Seek Help Locating Missing Man

The Peoria Police Department has issued a request for public assistance in locating 38-year-old Mark T. Vallianatos. He was last seen in the city on October 23, 2026.

Why it matters

Law enforcement officials are seeking community support to ensure the safety of a vulnerable missing person. Residents are encouraged to report any sightings or relevant information to assist in the search.

Mark T. Vallianatos is 38 years old and stands 5 feet 4 inches tall. Anyone with information is asked to contact the Peoria Police Department at (309) 673-4521.

The players

Peoria Police Department

This local municipal law enforcement agency serves the city of Peoria and is managing the search efforts for the missing person.

Mark T. Vallianatos

The 38-year-old man is a resident of the area who is autistic and non-verbal.

The details

Mark T. Vallianatos is autistic and non-verbal, and he was last seen in the area of North Prospect Road and East Division Avenue. He was wearing a long-sleeved shirt, black sweatpants, black slip-on shoes, and a black backpack at the time of his disappearance.

Mark T. Vallianatos was last seen at 3:30 p.m. on October 23, 2026.

Health Landscape

The search for this individual follows the patterns set by local and state emergency response protocols for missing vulnerable adults. These efforts reflect broader systems designed to prioritize safety for community members with specific care needs.

Residents in the area near North Prospect Road and East Division Avenue are asked to check their property or security cameras for any signs of the missing man. Those who believe they have seen him should prioritize reporting the sighting to the police at the provided phone number.

The takeaway

Community members can assist in the search by staying alert and reporting any sightings of individuals matching the provided physical description. Maintaining awareness of such public safety requests helps facilitate the timely location of vulnerable citizens.