Frequently Asked Questions
Here you can find answers to some of the frequently asked questions for postal codes and zip codes database. If you have a question which is not listed in the page, you can send us an email at

Frequently Asked Questions.

1. What is a zip code?
A postal code (known in various countries as a post code, postcode, or ZIP code) is a series of letters and/or digits appended to a postal address for the purpose of sorting mail. Once postal codes were introduced, other applications became possible. (source: Wikipedia)

2. Can I buy the database?
No, you can use it for free isn't it better?
The database is compiled from various public sources and by contributions by our visitors. You can freely use our website as a postal code or zip code reference any time.

3. I found an invorrect zip or postal code. Can you fix it?
Yes, please send us your corrections at and we will update it in our databse. This website works with the help of the collective efforts and contributions of our visitors.

4. What is the difference between Post Code and Zip Code?
ZIP codes are a system of postal codes used by the United States Postal Service (USPS) since 1963. The term ZIP, an acronym for Zone Improvement Plan,[1] is properly written in capital letters and was chosen to suggest that the mail travels more efficiently, and therefore more quickly, when senders use the code in the postal address. (source: Wikipedia)
In other words, ZIP code is the US term for Postal Code.

5. Why some countries do not have postal codes?
Some countries, simly do not use the postal code system. This is why we do not have entries for them.