IDAPA 39.02.60.100
License Plate Provisions For Standard Plates
01. County Designations. The county in which a vehicle is registered will be designated by a number and letter on license plates for motor vehicles registered under Section 49-402, Idaho Code, noncommercial vehicles up to sixty thousand (60,000) pounds gross weight, and recreational trailers. The county designators are as follows: (7-1-26)