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
Wednesday, June 10, 2026

The last day to make any changes to your voter registration or to register to vote is Monday, July 13th by 5pm. If you would like to make any changes or to check out your current status please give our office a call or stop by.

Yankton County Treasurer
Monday, June 1, 2026

Reminder: Yankton County residents that have last names starting with K and L have until June 30, 2026 to renew vehicle registration.
Yankton County
Monday, June 1, 2026

The Yankton County Government Center and all other non-emergency offices in Yankton County will be closed on Friday, June 19th, 2026 in observance of Juneteenth.
Yankton County Highway Department
Wednesday, April 1, 2026

The Yankton County Weed Department would like to remind that Yankton County landowners are required to control noxious weeds on their property. The Weed Department will begin their inspections on May 1, 2026.

To learn more information, please click here

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.