Average GPS coordinates for Potosi Postcode location: 37.955, -90.842. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Potosi on map:

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Listing cities & postcodes (1):
>> Missouri, 63664 Potosi, Washington, GPS coordinates: 37.9549,-90.8415