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. It's very important to note that ZIP Codes aren't "boundaries. They don't follow geographic or administrative boundary lines; they can cross city, county, or even state lines.
They follow where the delivery trucks go. Some ZIP Codes are special cases. Among them are "military" ZIP Codes, which include everything from military bases domestic or otherwise to battleships at sea. Then there are "unique" codes. Businesses and organizations sometimes get their own ZIP Codes, due to the volume of mail they send and receive. These are frequently benefiting from bulk mailing discounts, since the organization usually has a mail department that 1 presorts mail before giving it to the USPS, and 2 distributes mail internally so the USPS doesn't have to.
For postal code information for a foreign country, it is recommended that you contact the country in question or look for further information about that country's postal codes on the internet. Address may have been entered incorrectly, is an invalid address, or it may be a new construction address or a new housing development. Verify that the address you have is correct. If you still do not get a response and the address is a valid mailing address, contact the local Post Office and request their assistance in resolving the problem.
If undeliverable there, it is forwarded to the Post Office as stated by city and state. Go to USPS. Sign In. FAQs Home. How can we help?
Search for a topic. Quick Links. Document Outline. How to address a letter or parcel to the USA best www. You will need to write the name of the state in which the city, town or village you are sending to is located. Use the two-letter state abbreviation, such as MA for Massachusetts as shown above. You will also need to add a five-digit ZIP code postal code. Parcel Monkey.
Street address if applicable PO Box San Francisco CA In some cases, the postal code may precede the name of the addressee's city or country. For example, a London address might look like this:.
Nashville, TN Military address. International address. Related News Year End Review Department of PostsYour browser indicates if you've visited this link For more than years, the Department of Posts DoP has been the backbone of the country's communication and has played a crucial role in the country's social economic development. Why do we have five digits on each hand, and not some other number? Your browser indicates if you've visited this link The number of fingers and toes we have is thanks to our amphibian ancestors, but many animals have a different number, say our readers.
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Configure email address format in Exchange Mail More with the U. Postal Service How to write address on the envelope correctly 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.
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