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Please don't ever use integers for ZIP codes. In Germany there are ZIP codes (Postleitzahlen) that start with a 0.

Please don't use examples on a 13-year-old community wiki as recommendations, period!

See the many other comments I've made in this thread for how to handle elements of postal addresses in Django.

"Newbie Mistakes" - this will be read by new people and taken as good practice. They should change these examples.