Sheriffs, recorders, treasurers, assessors, and in counties having a population of over 7,500, prosecuting attorneys must have their offices at the county seat, and keep them open for the transaction of business on such days and during such hours as the boards of county commissioners may prescribe. Provided, that in counties having a population of 7,500 or less, the prosecuting attorney must have an office at the county seat and must, by and with the approval of the board of county commissioners, establish such rules and hours for official business as may be necessary for the dispatch thereof.
Idaho Code § 31-2009