Average GPS coordinates for Holyoke Postcode location: 42.186, -72.616. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Holyoke on map:

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Listing cities & postcodes (2):
>> Massachusetts, 01040 Holyoke, Hampden, GPS coordinates: 42.202,-72.6262
>> Massachusetts, 01041 Holyoke, Hampden, GPS coordinates: 42.1707,-72.6048