
Ensuring accurate zip codes is crucial for efficient delivery. A misplaced digit can lead to delivery delays or even failure.
The USPS recommends using a zip code lookup tool to verify the accuracy of zip codes. This can be done online or through a mobile app.
A single incorrect digit can cause a package to be sent to the wrong location. For example, a package sent to 12345 instead of 12346 may be delivered to a different city.
The consequences of inaccurate zip codes can be severe, including lost packages and damaged relationships with customers.
Writing the Address
Writing the address on a post is a crucial step to ensure your letter reaches its destination.
For informal letters, you should follow the same format as the sender's address. This means writing the recipient's name on the first line, followed by their street address, city, state, and ZIP code on the next lines.
In business settings, the first line should be the company's name, followed by "ATTN:" or "c/o" with the individual's name, and then the street address, city, state, and ZIP code.
If sending a letter to an overseas address, the address format typically stays the same, with the addition of the country name as the last line. Some countries place the ZIP code in front of the city and country, but it varies, so be sure to check.
You can add a bright border around the address to make it stand out for postal workers. This is especially helpful if you have a lot of text or a complex address.
To write an international shipping address, simply follow the standard address format and add the country name at the end.
Formatting and Accuracy
To ensure your mailpiece reaches its destination, it's crucial to have a standardized and validated address. The Delivery Address Line and Last Line of addresses should be complete, standardized, and validated with the ZIP+4 file and City State file, respectively.
For commercial mailings, addresses must be verified and corrected within 12 months before the mailing date using an approved method. This requirement applies to First-Class Mail, First-Class Package Service presorted parcel, Standard Mail, and Bound Printed Matter presorted and carrier route prices.
Addresses that meet the ZIP Code accuracy standard can be reused for 12 months, allowing you to save time and effort in the long run.
Zip Code Accuracy Standards
Zip Code Accuracy Standards are crucial for mail delivery. To meet these standards, addresses must be verified and corrected within 12 months before the mailing date using one of the USPS-approved methods in 6.2.
Addresses that meet this standard can be reused for 12 months to meet the ZIP Code accuracy standard for other classes of mail and prices. This can save time and effort in the long run.
The USPS uses a ZIP+4 file and City State file to validate addresses. This ensures that addresses are complete, standardized, and accurate.
Here are the key requirements for ZIP Code accuracy:
By following these standards, you can ensure that your mail is delivered accurately and efficiently.
Formatting Military Records
Formatting military addresses is a bit different from what you're used to. Military addresses don't use the city and state names you're familiar with.
The city name will be either APO (Air/Army Post Office), FPO (Fleet Post Office), or DPO (Diplomatic Post Office). This is a crucial part of a military address.

For the state, you'll use AA (Armed Forces America), AE (Armed Forces Europe), or AP (Armed Forces Pacific), depending on the duty station. I've seen this firsthand when sending packages to friends serving overseas.
The ZIP code is the same, but sometimes an extra four number code is required for delivery. Make sure to double-check this to ensure your package reaches its destination.
Here's a quick rundown of the military address formats:
Remember, accuracy is key when it comes to military addresses.
Dual
Dual addresses can be delivered to the address immediately above the city and state, or to the Post Office box if both are on the same line.
Mail with a dual address must have the ZIP+4 code or 5-digit ZIP Code correspond to the address element above the city and state, or with the Post Office box number if both are on the same line.
Dual addresses on return mail also follow these restrictions, ensuring consistency and accuracy in mail delivery.
International Shipping
International shipping can be a bit tricky, but don't worry, I've got you covered. The address format typically stays the same as in the UK, with the addition of the country name as the last line.
Some countries place the ZIP code in front of the city and country, but it varies from country to country, so just check to be sure. This means you'll need to research the specific address format for the country you're sending to.
The key things to include in an international postal address are the addressee's name, house number and street name, city or town, province, state or department and postal code, and the country. Always write the town and country in capital letters, with the full country name appearing last in the address.
Here's a handy checklist to make sure you get it right:
- Include the right international postcode.
- Put the postcode to the left of the town if your item's going to Europe.
- Write the town and country in capital letters.
- Don't forget to include your return address.
Remember, your return address needs to be in the UK, not in the destination country. And don't forget to include an Air Mail sticker unless you're using International Economy.
Delivery Options
When preparing a mailpiece, it's essential to consider the delivery address. The delivery address specifies the location to which the USPS is to deliver a mailpiece.
For mailpieces prepared with detached address labels, the address must be visible and legible only on the side of the piece bearing postage.
UK and International
If you're sending a letter to an overseas address that isn't military, the address format typically stays the same — just with the addition of the country name as the last line.
Some countries place the ZIP code in front of the city and country, but it varies from country to country, so just check to be sure.
For international shipping, it's essential to include the country name as the last line of the address.
You can check with the postal service or the recipient's country to confirm their specific address format requirements.
Sources
- https://www.today.com/home/how-address-envelope-t156576
- https://www.postoffice.co.uk/mail/how-to-address-mail
- https://www.roadrunnermailing.com/mailing-information-postal-regulations/addressing
- https://www.48hourprint.com/how-to-address-postcards-a-step-by-step-guide.html
- https://www.postageonlinenow.com/guides/basic-rules-to-be-aware-of/basic-posting-and-addressing/
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