Average GPS coordinates for Custer Postcode location: 43.657, -103.426. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Custer on map:

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Listing cities & postcodes (1):
>> South Dakota, 57730 Custer, Custer, GPS coordinates: 43.6573,-103.4258