Departments

Yankton County Extension Office

The Extension Office is located on the lower level of the Yankton County Government Center building, in the northwest corner.

Hours of Operation:

9:00am to 5:00pm
- June 08 to June 12 Hours

Phone:

(605) 665-3387

Fax:

(605) 665-2669

Address:

321 W 3rd St. Suite B02
Yankton, SD 57078

Staff

Madison Melcher

Program Assistant II (4-H Educator) 605-665-3387 Send an Email

Announcements

Yankton County

Friday, July 10, 2026

Notice to Public: To view the notice on a possible temporary emergency zoning ordinance moratorium on Data Centers, Ordinance #26-08, please click here

Yankton County Treasurer

Wednesday, July 1, 2026

Reminder: Yankton County residents that have last names starting with M and N have until July 31, 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