All were arrested for breaking into more than a dozen businesses and barns, stealing anything metal. They've hit 17 places in Arcola, Bowdre, Camargo, Murdock, Newman and Sargent Townships since May.
However, the sheriff's office says the threat is still out there. Two others are wanted for arrest warrants.
A sixth person has been summoned to court. Deputies urge residents to lock machine sheds. Also, to make sure doors are strong and secure.