https://pe.usps.com/text/pub28/welcome.htm https://pe.usps.com/text/pub28/welcome.htm And this is just the US postal system. The address system in my area is

https://pe.usps.com/text/pub28/welcome.htm https://pe.usps.com/text/pub28/welcome.htm And this is just the US postal system. The address system in my area is covered in Appendix D