How Can You Tell If a ZIP Code is Incorrect?

When using ZIP Codes, it is important to know if you are using the correct one. This will help your mail get to the right address, avoid returned mail, and improve your deliverability. There are several ways to check if your ZIP code is correct.


First, if you are using a bar code reader, you can use the "check digit" to make sure you have entered the correct one. The machine adds up all the digits and then checks to see if you have made a mistake. If you have, you can adjust your ZIP code.

Alternatively, you can use a free USPS address lookup tool. These tools can help you verify addresses faster.

Some companies, such as Experian, offer real-time address verification, which can help you ensure your addresses are accurate. Checking your ZIP codes in this way can save you money and time.

One of the biggest causes of ZIP code errors is incorrect state selection. For example, Wal-Mart employees often select Arkansas instead of Arizona. In this case, they will end up with a zip code that is incorrect.

In addition, the US Postal Service makes many changes to the boundaries of the ZIP Code areas. Sometimes, they overlap other ZIP codes. Using the wrong ZIP code could cause a package to be delivered to the wrong post office. Also, some ZIP Codes are assigned to large organizations that process a lot of mail.

While ZIP Codes can be useful for delivering mail, they do not accurately represent populations. They are also not a reliable measure of sales tax rates. Because of these issues, you should be wary of basing your sales tax rate on them. Moreover, basing your sales tax rates on incorrect codes can increase the risk of an audit.

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