Average GPS coordinates for Dewey Postcode location: 36.801, -95.935. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Dewey on map:

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Listing cities & postcodes (1):
>> Oklahoma, 74029 Dewey, Washington, GPS coordinates: 36.8012,-95.9345