Average GPS coordinates for Stockton Postcode location: 42.349, -90.02. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Stockton on map:

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Listing cities & postcodes (1):
>> Illinois, 61085 Stockton, Jo Daviess, GPS coordinates: 42.3492,-90.0202