Free list of UK postcodes The list is formatted as plain text, with each record on a separate line. Each record consists of five fields, each field being separated by a comma. You should be able to import this data into most applications that support "comma separated variables". The five fields are: 1. First part of the UK postcode (area code) 2. x-coordinate (metres) 3. y-coordinate (metres) 4. Latitude 5. Longitude