An easy to understand guide with photos that summarize the official USPS address formatting guidelines.
Unless you have studied the postal service’s requirements meticulously, you are very likely missing out on some crucial facts about addressing an envelope.
The instructions in this article applies to any envelope sent using the United States Postal service, whether it is the standard #10 envelope, a large manila envelope, or even a Priority Flat Rate Envelope, the USPS has standardized the addressing requirements.
Here’s an in-depth guide that provides expert insights on addressing an envelope in the right format for your letters or e-commerce business. The video below gives a good summary of the basics.
Start addressing the envelope by printing or typing your (the sender) address in the upper-left corner on the front of the envelope.
The sender's address is known as the "return address", also sometimes referred to as the “from” address. It is called the return address because this is the address that the post office will use in case the recipient address is incorrect or if the letter is for some reason refused.
If an envelope is somehow undeliverable, it will be mailed back to you immediately. This is only possible if you’ve written the return address on the envelope.
In our examples we will be using a #10 envelope, also know as business-sized, or standard envelopes in the United States.
The return address should be written, typed, or printed on the upper left corner of the envelope. It must clearly include your name, full street address and apartment or suite number (if applicable), city, state, and ZIP code. You can optionally include your business name on a new line under your name.
The apartment or suite number should be on the same line as the street address. If it cannot fit on a single line, place it on a separate line immediately above the street address.
For abbreviations of secondary address units such as suites and apartments, reference the USPS’ examples.
You'll notice that the return address in the above image follows the format:
SENDER’S COMPANY NAME (optional)
STREET ADDRESS or P.O. BOX
CITY STATE ZIP
In this particular case, there was not a company name included.
The format for the delivery address, which is the address of the person receiving, will follow the same format as the return address:
COMPANY NAME (optional)
STREET ADDRESS OR P.O. BOX
CITY STATE ZIP
The delivery address is to be written on the same side as the return address and stamp. The addresses should be printed or typed in a block of text near the center of the envelope. Address lines should written where the longest side of the envelope is horizontal, or in portrait orientation as seen in the example.
All addresses should follow formatting guidelines the below:
You may find using an address label with envelopes helpful especially if you have many envelopes to address. With labels you can write or print on the label and then place it on the envelope, but with USPS, you can write directly onto the envelope itself. These labels include spaces for a return address in the upper left corner and the delivery address in the center.
Include C/O If Necessary
The term C/O stands for ‘care of,’ which means ‘through someone,’ and businesses often use to make sure that the package isn’t returned to them.
It lets the postman know that the recipient mentioned on the envelope is not the typical recipient at that street address.
This means that the post office should deliver the envelope to the entity listed as C/O in the address, who should then give it to the person to whom it is addressed.
To use a C/O when addressing an envelope, you can simply mention the recipient’s name and write C/O and the name and address of the person, you are leaving the package in care of. So for example, if you want to send the package to a Scott Summers, in care of another person Charles Xavier, you’ll use this format:
C/O CHARLES XAVIER
1407 GRAYMALKIN LN
NORTH SALEM NY 10560
You can use "care of" when someone is vacationing in a hotel or staying at someone else's home temporarily.
C/O CHATEU MARMONT
8221 SUNSET BLVD
LOS ANGELES CA 90046
If your mail is destined to a recipient who has been deployed to a U.S. base, it’s essential to follow specific guidelines for formatting addresses.
The city name is replaced by APO (Air/Army post office), FPO (Fleet post office), or DPO (Diplomatic post office). These indicate which base the envelope will be mailed to.
Next, the state name is replaced by A.E. (sent to Europe, Middle East, Africa, and Canada), A.A. (within America), or A.P. (in the Pacific).
Here’s an example:
SGT JANE DOE
UNIT 802 BOX 74
APO AE 09499
Upper- and lower-case requirements, punctuation, postal codes, and province rules may vary with each destination. Therefore, you should always check the country’s guidelines before addressing an envelope.
However, ordinarily, you’ll only need to add the name of the country below the last line of the address.
CITY MUNICIPALITY PROVINCE or other designation POSTAL CODE
The third line includes the names of state, territory, county, district, or town. For most countries, the city line goes below the street address. Also, there may be exceptions, such as countries that prefer the postal code at the beginning of the third line while others include it at the end.
Many other countries require the postal code to be listed on a line by itself. Thus, you must view all the country’s preferred formats before writing an international address.
Post Office Box Format Options
When you are addressing an envelope for your customers, you should use standard abbreviations for the post office box and omit the periods. There are two ways that the P.O. Box information can be conveyed.
PO BOX XXXXX
City State ZIP
City State abbreviations
When you want to ship an envelope, these postage stamps are critical for ensuring that the delivery is successful. Various types of stamps can be bought from your shipping company – prices are based on their postage value, shipping, and other factors such as the weight, height, dimensions of the envelope, as well as the time frame of delivery.
Sending a letter for the first time can be intimidating, but once you become familar with addressing envelopes, it will become second nature. Also, you don't have to worry too much about getting the format exactly right the first time, the USPS has your back.