Average GPS coordinates for Merton Postcode location: 51.418, -0.215. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Merton on map:

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Listing cities & postcodes (2):
>> London, SW19 Merton, England, GPS coordinates: 51.4238,-0.2037
>> London, SW20 Merton, England, GPS coordinates: 51.4114,-0.226