Average GPS coordinates for Iona Postcode location: 43.576, -99.488. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Iona on map:

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Listing cities & postcodes (1):
>> South Dakota, 57542 Iona, Lyman, GPS coordinates: 43.5758,-99.4881