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 Highway Department

Wednesday, September 2, 2026

Yankton County is in the process of updating our Five-Year Highway and Bridge Improvement Plan. A public meeting will be held to discuss and answer questions about the proposed updated plan. The meeting will be held on Thursday, September 17, 2026, at 6:00 p.m. at the Government Center in the Commissioner Meeting Room. Click here to read notice

Yankton County Treasurer

Tuesday, September 1, 2026

Reminder: Yankton County residents that have last name starting with S, have until September 30, 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