Average GPS coordinates for Savanna Postcode location: 42.096, -90.14. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Savanna on map:

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Listing cities & postcodes (1):
>> Illinois, 61074 Savanna, Carroll, GPS coordinates: 42.0956,-90.1401