Average GPS coordinates for Dubuque Postcode location: 42.492, -90.742. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Dubuque on map:

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Listing cities & postcodes (5):
>> Iowa, 52001 Dubuque, Dubuque, GPS coordinates: 42.515,-90.6819
>> Iowa, 52002 Dubuque, Dubuque, GPS coordinates: 42.5122,-90.7384
>> Iowa, 52003 Dubuque, Dubuque, GPS coordinates: 42.4649,-90.6829
>> Iowa, 52004 Dubuque, Dubuque, GPS coordinates: 42.4849,-90.8041
>> Iowa, 52099 Dubuque, Dubuque, GPS coordinates: 42.4849,-90.8041