Average GPS coordinates for Merrimack Postcode location: 42.867, -71.513. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Merrimack on map:

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Listing cities & postcodes (1):
>> New Hampshire, 03054 Merrimack, Hillsborough, GPS coordinates: 42.8667,-71.5128