Illinois Zip Codes

What are Zip Codes for?

They are needed to simplify and speed up mail sorting and generally to speed up delivery.

ZIP or Postal code data is an integral part of business operations. It is an important parameter for sending mail, detecting fraud, or researching demographic information.

The role of the postal code is to process data quickly and efficiently in the Illinois. Errors in postal codes can cause delays in data processing. Each digit in a ZIP code carries a meaning.