What are the four digit numbers you sometimes see after a zip code?

Question

Does anyone know what these codes are for and how they work?

Answer 1

Those last four digits are like a ZIP code within a Zip code. In 1983 the U.S. Postal Service began using the expanded ZIP (Zone Improvement Plan) code in order to expedite shipping to specific office blocks, mailing centers, and other areas that receive a high volume of mail.
The last four numbers aren't mandatory, but they can help expedite delivery. You can find the "ZIP + 4" of any address in the United States by using this tool from the Postal Service.

The USPS also explains how ZIP codes break down: the first three numbers indicate a "sectional center" or large city, the second two indicate the specific post office facility, the third two indicate a sector or several blocks, and the last two indicate a segment or side of a street.

And finally, if you're using a ZIP+4, always remember to separate the first five numbers from the last four numbers with a hyphen. Your mail carrier will appreciate it. And incidentally, ZIP codes start with "0" on the east coast and increase westwards across the continent (hence "Beverly Hills 90210").

Answer 2

Four Numbers After Zip Code

Answer 3

4 Numbers After Zip Code

Answer 4

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The extra four digits after ZIP codes is known as the "ZIP+4" system. It helps aid USPS in sorting and delivering mail to a much more precise location within the five-digit ZIP region. It's kind of like a magnifying glass for a magnifying glass; 48309 is the region you want to send it to, and 7756 tells the postal system where precisely in 48309 the item needs to go, like a specific geographic sub-region, a P.O. box (sometimes those have their own individual +4 numbers), or an apartment complex. It helps the postal system deliver mail more fast and efficiently.

Answer 5

Those four numbers are for a specific address (Building, house, apartment) within the 5-digit ZIP code. If they are there, they are a way to help the mailman deliver them to the right place, in case the other part of the address is unreadable or missing.

Answer 6

It is an extended zip code.

In 1983, the U.S. Postal Service began using an expanded ZIP-code system called "ZIP+4", often called "plus-four codes" or "add-on codes." This means that that every single mailable point in the country has its own 11-digit number (at least in theory).


http://experts.about.com/e/z/zi/zip_code.htm

Answer 7

They are specific identifiers to your area. Many companies have their own four digit codes to identify them to the post office.

If you're curious what your own four digit code is, look at a bill you receive at the house...phone bill, etc...

Answer 8

They can stand for the individual house/building/post office box that a post office delivers to. It makes mail going to a big building or a post office get there quicker because you only have to look at the last line of the address.