Yankton County Equalization Department

Phone: (605) 260-4400, Opt 3
Fax: (605) 260-4493

Mailing Address:
321 West 3 St Suite 203 Yankton, SD 57078

Hours of Operation:
9:00 a.m. to 5:00 p.m. -- Monday - Friday (including the noon hour)

The Equalization's Office is located on the second floor of the Yankton County Government Center Building in the NE Corner.

The Yankton County Director of Equalization is appointed by the Yankton Board of Commissioners.

The function of the Director of Equalization Office is to annually value all real property in Yankton County at its full and true value.
The Director of Equalization and his/her staff are responsible for:
- Discovering, listing and valuing all real property within Yankton County
- Responsible for linking real properties to their respective owners and placing assessed values and owners' names on the assessment roll. Types of properties included in the assessment process are: residential, commercial, and agricultural classes of property.
- Responsible for determining the taxable value of over 14,000 parcels. The tax base in Yankton County is approximately 1.7 billion dollars.

The Director of Equalization has a number of additional responsibilities which include:
- Providing equalization between classes of property
- Deciding on adjustments to properties
- Reviewing all abatements
- Administering all state laws pertaining to the ad valorem property tax assessment
- Providing for the review and appeal of assessments
- Testifying in court on assessments
- Deciding on tax exemptions and tracking each exemption

The Director of Equalization and his/her staff must be certified by the South Dakota Department of Revenue in order to assess real property for tax purposes. After initial certification, appraisers must be re-certified every five years. Requirements for re-certification include: attending and passing the annual Department of Revenue sponsored school, USPAP, attending workshops, and attending the South Dakota Association of Assessing Officers Conferences.

Quick Links


Lori Mackey

Director of Equalization Send an Email

Matt Archer

Deputy Director Send an Email






  • Is my property information available online:

    Yes, to access Beacon click here

  • If I split a property, when will I be assessed and when will I pay taxes on the two pieces separately?

    If you split a property before November 1, 2017, known as Parcel A into Parcel B and C, your assessment value would be only on Parcel A and would be payable in 2018. Your 2018 assessment would be split between Parcel B and C for taxes payable in 2019.

  • If my new home is not complete by November 1, 2017, when will it be assessed?

    If your home is 60% complete on November 1, 2017, you will be assessed at 60% of its completed value for your 2018 assessment payable in 2019. If the home is then completed by November 1, 2017 you will be assessed at full and true value for 2019 assessment payable in 2020.

  • If I build a house that is completed on or before November 1, 2017, when do I pay taxes?

    If your home is complete before November 1, 2017, we will be out to view the home in 2017. The value we arrive at will be on your 2018 assessment notice, which you will receive around March 1, 2018. Then in 2019, you will receive a tax notice from the Treasurer for your 2018 assessment.


Highway Department Hours
Sunday, November 25, 2018

We will be in our winter hours starting with Monday, November 26, 2018.
Monday-Friday, 7:00am - 3:00pm

Veteran's Service Office - Interested Drivers
Thursday, September 27, 2018

Please contact our office if you are interested in driving the DAV van.

2018 Calendar
Monday, January 1, 2018
Yankton County Emergency Management
Monday, January 1, 2018

You can text YCOEM to 85511 to receive up to date emergency information.

Yankton County Commission Meeting Policy & Form
Thursday, November 23, 2017

Main Phone:

321 West 3rd Street, Suite 100 Yankton, SD 57078

Office Hours:
9:00am - 5:00pm CST, Monday-Friday
Closed on Holidays, Saturdays, & Sunday

Yankton County © 2018. Developed by Intuvio Solutions.