Average GPS coordinates for Seaside Postcode location: 45.903, -123.674. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Seaside on map:

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Listing cities & postcodes (1):
>> Oregon, 97138 Seaside, Clatsop, GPS coordinates: 45.9027,-123.6736