Towns & Cities

The Place We Call Home

Yankton County, established in 1862, is located along the southern border of South Dakota along the Missouri River. The county encompasses a total area of 533 square miles with a population of 23,310 (2020 US Census estimate).

The primary industries in the county are agriculture, manufacturing, and services.

The county seat is located in the largest city in the county - Yankton (population 15,411).

Our Cities and Towns

Announcements

Yankton County Auditor
Thursday, October 1, 2026

Absentee voting has started again as we have just received the new ballots. Make sure to bring your photo and we will be able to help you in the Commission Chambers
Yankton County Weed Department
Friday, September 18, 2026

The Yankton County Weed Department would like to remind Yankton County landowners that fall is a good time to take care of leafy spurge .

To learn more information, please click here
Yankton County Register of Deeds
Monday, September 14, 2026

As of September 14, 2026, the state has implemented a new vital records system. Please expect a delay in all services as we learn and navigate this new software.

September 14th – October 16th you will need to make an appointment to apply for a marriage license. Plan for this to take at least 30 minutes.

Notary services will not be available from September 14th – October 2nd.

Main Phone:
(605) 260-4400

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

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

Yankton County YouTube Channel

Yankton County © 2026. Developed by Intuvio Solutions.