Department of Equalization | Sully County
700 Ash Avenue, Onida, SD 57564
Eligibility
Open to all
Hours
7:30am - 4:30pm (CT), Monday - Friday
605-258-2522
Voice·
Main Phone
Application process
Call for information
Fees
Vary; call for information
Service area
Sully County, SD
Other Information
Age Group
- Young Adults (18-24)
- Children (0-17)
- Older Adults (65+)
- Adults (25-64)
Purpose is to locate, identify, and appraise all taxable property, in accordance with state laws and administrative procedures, while maintaining current information on the ownership and characteristics of property.
Also, this office prepares and certifies the assessment roll and individual property assessments in accordance with state law.
Last Assured
10/06/2025
Providing organization
Sully County
Serving the citizens of Sully County.