How do I lookup USPS® ZIP Code™ by address? Learn how a ZIP Code works and how to read them. Find ZIPs by address or city and state now.
The full ZIP Code identifies a small mail delivery segment such as a street, a city block, a group of apartments, or even an individual street address that receives a high volume of mail. The ZIP+4 Code is not required and is usually calculated automatically when the mail is sorted and ...
The "Eircode", the official name of the Irish ZIP code, resembles the United Kingdom system. The Irish system is also composed of an alphanumeric sequence. Since from the introduction this system was subject to several critiques: while the start of the seven-point code (the "Routing Key")...