Joseph Maynard was last seen on Friday morning as he left his home on Daniels Drive in Genoa.
He was wearing a tan carhart jacket and khaki pants.
The Genoa-Kingston Fire Department, Illinois Department of Conservation Police, and the DeKalb County Sheriff’s Office are all involved in the search for the 19-year-old.
On Sunday, more than 150 volunteers scoured the area for Maynard.
K-9 teams and drones have also been brought in to help.