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
Friday, October 3, 2025

The Yankton County Government Center and all other non-emergency offices in the county will be closed on Monday, October 13th, 2025 in observance of Native American Day.
Yankton County Emergency Management
Thursday, October 2, 2025

Please view the link on learning more about the opportunity in receiving the flu shot free October 18th, at the Yankton High School Auxiliary Gym

Flu Shot Flyer
Yankton County Treasurer
Wednesday, October 1, 2025

A reminder to all residents that the second half of property taxes is due by October 31st. There are several convenient ways to pay. You can pay in person, by mail, by our secure drop box or you can pay on-line. For more information please see the Treasurer's page under the Departments tab or call our office.

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 © 2025. Developed by Intuvio Solutions.