Average GPS coordinates for Shamrock Postcode location: 35.912, -96.578. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Shamrock on map:

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Listing cities & postcodes (1):
>> Oklahoma, 74068 Shamrock, Creek, GPS coordinates: 35.9124,-96.578