Average GPS coordinates for Silvis Postcode location: 41.501, -90.413. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Silvis on map:

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Listing cities & postcodes (1):
>> Illinois, 61282 Silvis, Rock Island, GPS coordinates: 41.5007,-90.4126