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This allows you to deal with differences between the placement of postal codes, for example, between different countries.
Sure, you can write an analyzer and a formatter that handle the eccentricities of different countries (for instance, US addresses have 2 or 3 lines; by contrast, British addresses can have considerably more; one address I write to periodically has 9 lines).
(We ended up registering those people with an address abroad in the country with ISO-code 'ZZ'.) Unless you are going to do maths on the street numbers or zip / postal codes, you are just inviting future pain by storing them as numerics.
You might save a few bytes here and there, and maybe get a faster index, but what do you when US postal, or whatever other country you are dealing with, decides the introduce alphas into the codes?
Different countries have different conventions - in some, the house number comes before the street name, in some it comes after.