The Universal Postal Union (UPU) has a bunch of handy references for global addresses components and formats. It's been a very handy reference for when working with HR data and addresses for workers in different countries.

• POSTCODE® DataBase
• General Addressing Issues has information about variations on required fields for different countries.
• Postal addressing systems in member countries and/or territories shows example addresses and explanations of the different components required for different fields.