Welcome to Sioux County Assessor

Welcome to the Sioux County Assessor's web site. We hope this will provide you with information you need and make contacting us easier and more efficient. It is our goal to provide quality customer service to the residents of Sioux County through all our departments and be prudent and responsible in managing the financial assets of the county.

Ross Simmelink * Phone (712) 737-4274 * [email protected]
Term: 6 Years * Term Expires: 2027* Lobby Hours: 8:00a.m - 4:30p.m

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Assessor Information:

  • The primary duty of the Assessor is to assess all real property within the Assessor's jurisdiction exept that which is otherwise provided by law. This would include Residential, Multi-Residential, Commercial, Industrial and Agricultural classes of property.

    Dates To Remember:

  • January 1: Effective date of current assessment
  • April 2 - April 30: Protest of assessment filing period
  • May - Adjournment: Board of Review meets each year
  • July 1: Signup deadline Homestead and Military tax credits
  • October 9 - October 30: Protest filing period if IDR Equalization has been issued

Frequently Asked Questions: