Idaho Code § 34-1402: Registration.

All electors must register with the county clerk before being able to vote in any primary, general, special or any other election conducted in this state. The county clerk shall determine, for each registered elector, the elections for which he is eligible to vote by a determination of the applicable code areas. The determination of tax code area shall be made for all political subdivisions including those otherwise exempt from the provisions of this chapter.

The county clerk shall conform to the provisions of chapter 4, title 34, Idaho Code, in the administration of registration for all political subdivisions within the county.