Average GPS coordinates for Sandown Postcode location: 42.931, -71.186. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Sandown on map:

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Listing cities & postcodes (1):
>> New Hampshire, 03873 Sandown, Rockingham, GPS coordinates: 42.9308,-71.1861