Validating addresses usps understanding dating
An address with a ZIP 4 code (or nine-digit ZIP code) is considered to be valid.In most cases, this means that the address is deliverable.The following methods are used to achieve the most accurate address possible: Because a misspelling usually results in an undeliverable address, commonly misspelled words are corrected. Due to the large number of possible misspellings, not all of them can be accurately detected and corrected.Many cities have several different, commonly used names.Only a city that is "preferred" or "acceptable" is recognized as standard.These systems attempt to correct incorrect city names and any that cannot be corrected are rejected. This means that it must have a street, city, state and ZIP code.Each ZIP Code in the Address Management System has one preferred city name and may have one or more acceptable city names.
Address validity is based on many different factors, including address renumbering (via the USPS Locatable Address Conversion System) and address completeness.Please enter a username which will uniquely identify you with the United States Postal Service.Passwords must be at least 8 characters in length and include at least one uppercase letter, one lowercase letter, and one number.Whenever possible, addresses that are incomplete have the missing information added.If a valid ZIP code is provided but the city and state are missing, the city and state names are added.
However, if the USPS has the address listed as "VACANT", it is not delivered, even though the address is valid.