Average GPS coordinates for Siřem Postcode location: 50.233, 13.5. (Notice: some coordinates are "GEO located" from street addresses. These numbers may be inaccurate. With this map you can check the coordinates.). Siřem on map:

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Listing cities & postcodes (1):
>> Louny, 438-01 Siřem, GPS coordinates: 50.2333,13.5