Postal codes are a system of numerical codes used to identify specific locations within a country. The codes are typically assigned to geographical areas, such as towns, cities, or streets. The first three digits of the code identify the region or district, while the last three digits identify the specific post office. Postal services use the codes to route mail and other items to their proper destination.

United States Zip Codes

United Kingdom Postal Codes

Canada Postal Codes

North America


South America

Postal System and Mail Delivery in the Past

Postal communication first appeared about 5,000 years ago in Mesopotamia to convey information imprinted in the form of clay writing. Postal communication in Egypt is no less ancient. Initially such services were used mainly for military purposes and were not intended for communication between civilians.

USА ZIP Codes Boundaries 2022

The zip codes used in the United States are generic zip codes. Such codes help the United States Postal Service (USPS) distribute and deliver mail efficiently and quickly.

9-digit United States Zip Codes

In this article, we will break down the topic concerning postal codes + 4. Zip codes plus 4 are the last 4-digit ciphers of the full 9-digit zip codes.




World Zip/Postal Code

What is a postal code and what is it for?

A postal or zip code is a series of numbers or letters. Almost all countries in the world now use postal codes. If a code is correct, it will affect the delivery of any mail you send or receive. Using a postal code makes it easier to sort mail and speed up delivery.

With the help of our website you can find the code of the region, area or county you need. Just use the search and look up the zip code.