From the Pottawattamie County Auditor's Office:
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Due to construction at the courthouse, the absentee ballot drop box has been moved further down the driveway to remain accessible to voters. The drop box is now located on the north side of the building, between the Courthouse and the Courthouse Annex. You must enter from S 6th St to access the driveway and may have to get out of your vehicle to reach the box. Because of construction you will have to turn around and leave out the same S 6th St entrance.