 Postal address verification tools and services are offered by the USPS and third party companies to help ensure mail is deliverable by fixing formatting, appending information such as ZIP code and validating the address is a valid delivery point.Customers can look up ZIP codes and verify addresses using USPS Web Tools available on the official USPS website and Facebook page, as well as on third-party sites.Delivery Point Validation (DPV) provides the highest level of address accuracy checking.