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 Treasurer
Thursday, January 1, 2026

Reminder: Yankton County residents that have last names starting with A and B have until January 31, 2026 to renew vehicle registration.
Yankton County Commissioners
Friday, December 19, 2025

YANKTON COUNTY COMMISSION NOTICE

The Yankton County Commission is looking for individuals with interest in joining a Financial Planning Task Force. Please contact Commissioner Don Kettering at (605) 660-4303 if interested.

The task force will be appointed to begin work in January 2026.
Yankton County Highway Department
Tuesday, December 2, 2025

The Yankton County Highway Department will begin their winter hours on Monday, December 01, 2025 and will run until further notice.

At this time the winter hours are:
Monday through Thursday: 6:30am to 5:00pm.

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

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