Extra four zip code digits

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One of the most frequent errors in writing out an address relates to the zip code — particularly the four extra zip code numbers sometimes found at the end of your address. You may have seen these when receiving a package that was addressed automatically or you might have seen this zip code as a suggestion when ordering something online. When someone asks for your zip code, you probably reply with a string of five numbers. This is the norm for most people and has actually been the norm for the U.

When zip codes were first introduced in , it was a part of an initiative to make mail delivery in the U. Most frequently, your five digit zip code represents the destination of the post office your mail is sent to before being handed off to your mail carrier. Each number of a zip code corresponds to a specific piece of information about the destination. The first number, between , denotes a geographic area of the U.

The second two numbers of a zip code specify a specific region within that geographic area and the last two are meant to indicate a specific Post Office. More and more companies are requiring it on paperwork and forms.

We are a licensed distributor of the U. Our databases contain every street and address range in the U. Enter a ZIP Code to see all information regarding it.

Even though they all mean the same thing, The U. The last four digits are not specific to a city but to a street address or Post Office Box. ZIP Codes start with a zero 0 in the northeast and gradually A ZIP Code generally refers to a geographical area; possiblya village, or a section of a large city. Some of these much smaller areas can be one side of a street within a block, or even a post Office box. Yahoo Web Search Yahoo Settings. Sign In. Search query.

All Videos Images News. Local Shopping. Anytime Past day Past week Past month. That's where the "plus 4" part comes in. We're getting ahead of ourselves, though, so let's start with the basics. If you're mailing a letter from Boston to Seattle, the mail carrier in Massachusetts doesn't really care what the street address of the destination is. It's what you might call "outside his jurisdiction. A postal worker can only cover so much ground on a given day.

And since the USPS has a standard of delivering in rain, sleet or snow, that rules out the possibility of doing the service of delivering in stages some today, some tomorrow.

That means that any given post office is only servicing what it can reach in a day. ZIP Codes reflect that. Typically, a ZIP Code is tied to a post office; by that we mean, every one of the latter has one of the former. You might think of ZIP Codes as a mailing address for a particular post office. Some do handle more than one ZIP Code, but a one-on-one game plan is the norm.