Average GPS coordinates for St John's Postcode location: 51.478, -0.026. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). St John's on map:

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Listing cities & postcodes (1):
>> London, SE8 St John's, England, GPS coordinates: 51.4776,-0.0261