One of my blog readers, Don, sent me some additional information on ZIP+4 from the website
https://www.zip-codes.com/learn-about/what-is-a-zip-4-code.asp. It gives more information about how closely the value specifies the location (I added the yellow highlight in the text that I copied in below):
What are those last four numbers in a nine-digit ZIP Code? People call and ask for the "Full ZIP Code", the "Last 4 Digits" of their ZIP Code, the "9 Digit ZIP Code", the "numbers after a ZIP Code", the "4 digit extension" and so on. Even though they all mean the same thing, The U.S. Postal Service refers to these numbers as the "ZIP +4 Code".
To determine a ZIP +4 Code you will need to know an address. The last four digits are not specific to a city but to a street address or Post Office Box.
This is what an address looks like with the ZIP +4 Code:
The first five digits
identify the area of the country and the delivery office to which the
mail is directed. ZIP Codes start with a zero (0) in the northeast and
gradually get higher as you move west. ZIP Codes in the far west start
with a nine (9).
The sixth and seventh digits
point to a delivery sector, which may be several blocks, a group of
streets, a group of Post Office boxes, several office buildings, a single high-rise office building, a large apartment building or a small geographic area.
The last two digits
represent a delivery segment, which might be one floor of an office
building, a side of a street, specific departments in an office, or
specific Post Office boxes.
It's good to know your ZIP +4 Code. More and more companies are requiring it on paperwork and forms. The U.S.P.S. does not mandate
that packages or letters need the +4 code. However, using the correct
ZIP+4 reduces the number of times your mail is handled and can decrease
the chance of a misdelivery or error.
Click here to find your ZIP +4 Code!
We are a licensed distributor of the U.S. Postal Service ZIP Code Data. If you are in need of a ZIP +4 Database, check out our U.S. ZIP+4 page. Our databases contain every street and address range in the U.S., along with the corresponding ZIP +4 Code.
So, there you have it! It does point to a specific post office box (so, our ZIP+4 may point directly to our "pendaflex folder" at the Escapees Mail Forwarding Service), but it probably does *not* correspond to a specific house on a street.
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