Departments

Yankton County Extension Office

The Extension Office is located next to the 4-H fairgrounds on Whiting Drive.

Extension Office

Monday through Friday
9:00am to 5:00pm

(605) 665-3387

(605) 665-2669

901 Whiting Drive
Yankton, SD 57078

4-H Youth Development Coordinator Send an Email

Yankton County Treasurer

Tuesday, July 1, 2025

Reminder: Yankton County residents that have last names starting with M and N have until July 31, 2025 to renew vehicle registration.

Yankton County Highway Department

Tuesday, April 1, 2025

The Yankton County Highway Department will begin their summer hours on Monday, April 07, 2025 and will run until further notice.

Summer 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