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

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 Weed Department

Friday, September 18, 2026

The Yankton County Weed Department would like to remind Yankton County landowners that fall is a good time to take care of leafy spurge .

To learn more information, please click here

Yankton County Register of Deeds

Monday, September 14, 2026

As of September 14, 2026, the state has implemented a new vital records system. Please expect a delay in all services as we learn and navigate this new software.

September 14th – October 16th you will need to make an appointment to apply for a marriage license. Plan for this to take at least 30 minutes.

Notary services will not be available from September 14th – October 2nd.

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