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ZIP+4 codes are block-level delivery areas and in order to get a ZIP+4 for any given address you must process an address through an address verification service. To summarize, ZIP codes are USPS delivery areas, not necessarily matching any political borders. Since there are only 300 Million mailing address in the US, that still leaves some room for growth. There are 42k unique ZIP Codes currently in use and that means that the possible number of ZIP+4 codes is 420 Million.
#FIND US ZIP CODE CODE#
The ZIP+4 code designates a specific area, typically a city block or grouping of houses and so is much more precise.
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If there is a remote mountain road that is only accessible from a small town in Alabama but that road crosses over into Mississippi, the addresses on that road will be serviced by the post office (or ZIP Code) that is in Alabama.īecause of this seeming inconsistency, a 5 digit ZIP Code is not as valuable as a 9 digit (or ZIP+4) code. That is because a ZIP code is not a physical boundary but a postal route designed with convenience and efficiency in mind. Yes, there are some ZIP codes that exist in multiple states. Keep in mind, that a ZIP Code can span multiple cities, counties, and even states. They offer A LOT of metadata about ZIP Codes. Ones that I have worked with in the past is zip-codes or zipinfo. There are many ZIP Code database services. It sounds like you want to find the ZIP Codes with "P" type, meaning they service a PO Box only. M - Military - Military bases overseas - and often vessels and ships - are given a "military" ZIP Code type. U - Unique - Companies, organizations, and institutions that receive large quantities of mail are given a "unique" ZIP Code type. P - PO Box Only - Rural towns, groups of towns, or even high-growth areas of cities are given a "PO Box Only" ZIP Code type. S - Standard - A "standard" ZIP Code is what most people think of when they talk about ZIP Codes - essentially a town, city, or a division of a city that has mail service. The USPS designates each ZIP Code with a "type" to help them sort mail more quickly. Many times, a remote, or extremely rural address will still be serviced by UPS or Fedex. Certainly anyone can get a PO box at the nearest Post Office. Not even to a common mail receptacle or group of mailboxes. Let me point out first that there are also addresses that the US Post Office doesn't deliver to at all.