Average GPS coordinates for Altona Postcode location: 41.113, -90.16. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Altona on map:

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Listing cities & postcodes (1):
>> Illinois, 61414 Altona, Knox, GPS coordinates: 41.1128,-90.1598