In the map, 0 is closer to white and 9 is much more vivid. It's easy to follow the gradient across each of the zones even though there are a few exceptions such as the southwest tip of Georgia which uses 39XXX like central Mississippi.
Despite the fact that ZIP codes seem to be geographic in nature, that wasn't their intended purpose. They are intended to group mail to allow the USPS to deliver mail more efficiently. 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. However, some ZIP codes have nothing to do with geogaphic areas. When ZIP codes appear to be geographically grouped, a clear shape cannot always be drawn around the ZIP code because ZIP codes are only assigned to a point of delivery and not the spaces between delivery points. In areas without a regular postal route or no mail delivery, ZIP codes may not be defined or have unclear boundaries.
The main issue is discussed above: there simply isn't always a clear geographic boundary for a ZIP code. The Census Bureau and many other commercial services will try to interpolate the data to create polygons shapes using straight lines to represent the approximate area covered by a ZIP code, but none of these maps are official or entirely accurate. They provide a very close approximation of the area covered by a ZIP code. You can easily notice some of the boundary issues when viewing our maps.
Very rural areas aren't labeled as belonging to a ZIP code such as much of Nevada and Utah where there are few, if any, addresses to deliver mail. If the address is on the same street as a ZIP code boundary on the map, be sure to search for the full street address to determine the ZIP code instead of relying on the map. Their purpose is to convey statistical data about regions that are familiar to most citizens.
As discussed above, it is difficult to precisely define a geographic area covered by a ZIP code. ZCTAs were developed to account for some of the difficulties in assigning an area to a ZIP code and to precisely define a geographic area.
A 9-digit ZIP Code is made of two parts. The first part is the first five digits of the zip code which indicates the destination post office or delivery area. The last 4 digits of the nine-digit ZIP Code represents a specific delivery route within that overall delivery area.
Toggle navigation Cordylink. Keyword Research: People who searched last 4 digit zip code lookup also searched. Frequently Asked Questions.
What are the last four digits after a ZIP code? They're only provided for an address once the address has been standardized , validated and proven real. These codes indicate a specific delivery route , meaning the actual path the mail truck would travel in a single drop-off. Usually this comprises ten to twenty homes or locations.
Because ZIP codes plus 4 extra digits are based on delivery routes instead of more permanent boundaries, the last 4 digits of a complete ZIP Code can change often. Not so for the full 9-digit ZIP Code. For another thing, they can help get you those bulk mailing discounts. Another important benefit to using the last four digits of ZIP Codes is delivery speed. That's right, your mail can show up faster if you label things right. Bet you're scrambling for those codes now, huh?
Get those extra 4 digits. If you want to try it on a single address, you can use our single address verification tool now. Go ahead and perform some postal address verification. Or you could call us instead if you'd rather talk to a real person.
We'd offer a fake person, but we don't have one of those on staff. SmartyStreets is now.
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