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, February 13, 2026

The Yankton County Government Center and all other Yankton County non-emergency offices in the county will be closed on Monday, February 16, 2026 in observance of Presidents Day.
Yankton County Extension/4-H
Friday, February 13, 2026

Our office hours for the week of February 16th to February 20th can be found here

To visit with Madison and to learn more about the exciting things going on at the Yankton County 4-H, you can call, email or stop by 901 Whiting Drive Yankton, SD

Yankton County Treasurer
Sunday, February 1, 2026

Reminder:
Yankton County residents that have last names starting with C, D and E have until February 28, 2026 to renew vehicle registration.

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.