Average GPS coordinates for Sentinel Postcode location: 35.162, -99.171. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Sentinel on map:

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Listing cities & postcodes (1):
>> Oklahoma, 73664 Sentinel, Washita, GPS coordinates: 35.1617,-99.1706