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So, USPS created 9-digit ZIP Codes to ensure fast and accurate mailings. They indicate the actual path the mail should travel and usually they narrow down to somewhere between ten to twenty homes.

Full 9 Digit ZIP Code Benefits (ZIP+4 Lookup) Faster Shipping - Each ZIP+4 Code represents segments of delivery routes that are usually within a single block of the desired delivery point. That simple 9-digit number makes routing more efficient since the USPS knows which mail person will put the letter in the mailbox.

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.

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!

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!

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.

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.

Also called ?plus-four codes?, ?add-on codes?, or ?add-ons?, the ZIP+4 code starts with the standard five-digit ZIP Code. The four extra numbers are added after a hyphen to complete the ZIP+4. So what do the extra numbers mean? These last 4 digits represent specific delivery routes within delivery areas.

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.

United States ZIP codes are five numerical digits long. ZIP+4 codes, also known as add-on or plus-four codes, include four additional digits that identify a geographic segment within a ZIP code delivery area.