The most common cause of incorrect ZIP code errors is the selection of the wrong state. For example, Wal-Mart employees often receive an error for choosing AZ (Arizona) instead of the correct state of AR (Arkansas). Please verify that you have entered the correct state information.

If you have verified that you entered the correct state, you will need to look up the correct ZIP code on the United States Postal Service ZIP Code Lookup website.

Note that any link in the information above is updated each year automatically and will take you to the most recent version of the document at the time it is accessed.