Yankton, SD is currently using only one area code which is area code 605. Area code 605 covers the entire state of South Dakota and was established in 1947.
In addition to Yankton, SD area code 605 serves the larger cities and communities of Aberdeen, Pierre, Rapid City, Sioux Falls, and Watertown in addition to many smaller communities within the service area.
Yankton, SD is located in Yankton County and observes the Central Time Zone.
View our Times by Area Code tool.