Idaho Code § 49-443B
(2) Each license plate issued pursuant to this section shall bear a designator to identify the agency, entity or office to which a vehicle belongs. The designators shall be as follows:
Designator Agency, entity, office, or plate type C School district or miscellaneous city or county agencies, entities or offices D Highway district F Fire district G Fish and game H Department of health and welfare ISP Idaho state police J Department of commerce or department of labor L Law enforcement P City police R Department of parks and recreation SO Sheriff’s office T Department of transportation X Miscellaneous state agencies, entities or offices Y Irrigation district Z Department of lands
[49-443B, added 1992, ch. 35, sec. 27, p. 130; am. 2014, ch. 38, sec. 9, p. 78; am. 2018, ch. 93, sec. 3, p. 200; am. 2020, ch. 86, sec. 2, p. 232; am. 2025, ch. 22, sec. 2, p. 66.]