Yankton County ZIP Codes
South Dakota, United States · 6 codes
Yankton County in South Dakota has 6 ZIP codes, from 57031 to 57078, serving 6 places.
ZIP codes in Yankton
Frequently asked questions
What is the ZIP code of Yankton?
Yankton has 6 ZIP codes, from 57031 to 57078. The table lists the places each one serves.
How many places are listed in Yankton County?
6 places.
Source: GeoNames postal codes (CC BY 4.0), geonames.org, retrieved 2026-10-22. Place coordinates are approximate. Check with the national postal service before sending anything valuable.