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No, they are not unique. Each country has its own system of post codes, and they sometimes do overlap. You are supposed to write the name of the destination country in the last line of the address to tell the postal service where to send the letter.

The Tiniest: 11109 (map) A two-block area across the East River from Manhattan, this ZIP code in Long Island City is among the smallest in the country at a tenth of one square mile. It boasts 1,400 people in that area, though, pushing its residents-per-square mile rate to the top of the list, according to Esri.

In 1963 the Post Office Department introduced and vigorously promoted the use of the Zone Improvement Plan (ZIP) Code. The code was originally intended to allow mail sorting methods to be automated but ended up creating unimagined socio-economic benefits as an organizing and enabling device.

A. ZIP code data changes frequently. Every year there are thousands of changes to the USPS ZIP Code records.ZIP codes are created or discontinued.

' The manager of delivery operations must make a final decision on the appeal within 60 days. The most common form of request to the Postal Service (and to Members of Congress) is for a new ZIP Code for a specific area.

Zip codes were created for the efficient delivery of mail and are not adjusted for the needs of other entities. New nine digit zip codes are created every day, anytime a new delivery address appears from new construction.

But the Postal Service can suspend the office for a lease or staffing issue or the condition building, and as explained in the Postal Service's Discontinuance Guide, suspensions are one of the factors that may prompt a study to discontinue.