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Also, postcodes have a geographic area. Here in the UK, postcodes can be non-geographic: http://www.royalmail.com/sites/default/files/docs/pdf/11july_current_no

• jmnicolas 9y ago
  I remember trying to deliver an urgent parcel in London (I was coming from France) and discovering that the address numbers don't follow each other and are not organized by odd numbers on one side of the road and even numbers on the other side. So you could have house number 200 between 15 and 42 ... of course I had to go the full length of the street before finding the right address. I remember feeling sympathy for English postmen back then ;-)
  • Larrikin 9y ago
    In Japan, most streets don't have names and buildings are numbered based on when they were built. Even with Google maps most businesses provide a drawn map showing nearest convenient stores and stations.
  • IshKebab 9y ago
    They are usually odd on one side, even on the other. But not every road fits into that neat pattern so sometimes you get them all on one side. They should be in a vaguely sensible order though - it would be very weird to get 200 between 15 and 42.
• taneq 9y ago
  In Australia, postcodes have a many:many relationship with suburbs. A single postcode can cover multiple suburbs and a single suburb can have multiple postcodes. I think postcodes are geographically contiguous but I'm probably wrong. :P
  • maxerickson 9y ago
    In the US postcodes have no fixed relationship at all with administrative areas, they are just lists of addresses. A code might span a county or be limited to a small village.