Countries
Tryton comes with builtin functionalities for specific country related data like postal codes or subdivisions.
You can import them in the following way (first line for Vanilla Installation only):
$ cdexe
$ trytond_import_countries -c /path/trytond.conf -d <database>
$ trytond_import_postal_codes -c trytond.conf -d <database> <two_letter_country_code>
Further Reading: