Average GPS coordinates for Hecla Postcode location: 45.873, -98.192. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Hecla on map:

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Listing cities & postcodes (1):
>> South Dakota, 57446 Hecla, Brown, GPS coordinates: 45.8725,-98.1918