Average GPS coordinates for Chatham Postcode location: 42.35, -73.587. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Chatham on map:

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Listing cities & postcodes (1):
>> New York, 12037 Chatham, Columbia, GPS coordinates: 42.3496,-73.5873