County Treasurer’s Office 822 Douglas St. Trosper Hoyt BuildingSioux City Iowa 51101 IA USA 822 Douglas St. Trosper Hoyt BuildingDirections (712) 279-6500 Monday 08:00 am - 04:30 pm Tuesday 08:00 am - 04:30 pm Wednesday 08:00 am - 04:30 pm Thursday 08:00 am - 04:30 pm Friday 08:00 am - 04:30 pm Saturday Closed Sunday Closed