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ZIP codes have nothing to do with the lines that define a county. One ZIP code could include addresses in multiple counties and a single county might include hundreds of ZIPs!

Some ZIP codes will span multiple states in order to make mail routing and delivery more efficient. In most cases, addresses in close proximity to each other are grouped in the same ZIP code which gives the appearance that ZIP codes are defined by a clear geographic boundary.

UnitedStatesZipCodes.org is the most comprehensive resource for United States zip code data.

These last 4 digits represent specific delivery routes within delivery areas. This extra detail means an even more precise matching to a more granular level. It could represent a handful of houses on one side of a street, or even a single building that receives a high volume of mail.

Some cities cross into five different counties and as many as 20% of the ZIP Codes cross county lines. This means that if you enter a city or ZIP Code into our tool, it may return information for more than one county. Conversely, a single address will only ever be located in one county.

Primary state prefixes. ZIP Codes are numbered with the first digit representing a certain group of U.S. states, the second and third digits together representing a region in that group (or perhaps a large city) and the fourth and fifth digits representing a group of delivery addresses within that region.

Many cities will have multiple towns or suburbs with the same name like in the example above. If the US Postal service has more than one zip code for a city, we will list the city with each of the zip codes.

In the real world, ZIP code boundaries often cross county boundaries. This means that a particular ZIP code may lie in several counties. In fact more than 20 percent of all ZIP codes lie in more than one county. For example, ZIP code 38583 covers portions of five different counties!