Average GPS coordinates for Yankton Postcode location: 42.875, -97.394. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Yankton on map:

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Listing cities & postcodes (2):
>> South Dakota, 57078 Yankton, Yankton, GPS coordinates: 42.8821,-97.3986
>> South Dakota, 57079 Yankton, Yankton, GPS coordinates: 42.8676,-97.3903