Average GPS coordinates for Seneca Postcode location: 45.026, -99.461. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Seneca on map:

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Listing cities & postcodes (1):
>> South Dakota, 57473 Seneca, Faulk, GPS coordinates: 45.0262,-99.461