In no particular order...

* UK post codes are a combination of letters and numbers. Not living there myself, I don't know the pattern, but the length does not seem fixed.

* Addresses in some part of Asia routinely require 3 lines. Plus locality and postal code! I learned that writing software for a school that had a lot of international students from China and Taiwan.

* For a way-out example, Japanese addresses, particularly those in cities, do not have street names or street numbers! Instead they sub-divide from locality down three more levels (machi, chome and banchi) then buildings are numbered in their banchi. E.g, Kodansha Publishing is at 17-41 Otawa 1-chome, Bunkyo-ku, Tokyo 112-8652.

Wade.