
USPS tracking numbers are a combination of 20 characters, including both letters and numbers, that identify a package as it moves through the mail system.
Each section of the tracking number corresponds to a specific piece of information, such as the post office where the package was sent or received.
The first 5 characters of the tracking number represent the post office where the package was sent, which can be used to identify the origin of the package.
A tracking number can be used to check the status of a package, including whether it has been shipped, delivered, or is still in transit.
What Are USPS Tracking Numbers?
A USPS tracking number is a unique code assigned to every package or mail item shipped through the United States Postal Service. It's a vital tool that allows senders and recipients to monitor a package's journey, confirm its delivery, and initiate claims or investigations if the package is lost or delayed.
The standard format of a USPS tracking number consists of 22 characters, structured as follows: it begins with two letters, followed by nine digits, and ends with two more letters. Each component has a specific purpose, with the first two letters identifying the type of mail service used, such as Priority Mail or First-Class Mail.
The middle nine digits serve as a unique package identifier, ensuring that every shipment is distinguishable. The final two letters function as check digits, which verify the validity of the tracking number and prevent errors in the system.
Broaden your view: Track My Mail from Post Office
What Is a Number?
A USPS tracking number is a unique code assigned to every package or mail item shipped through the United States Postal Service.
It's made up of 22 characters, with a specific format: two letters, followed by nine digits, and ending with two more letters.
The first two letters identify the type of mail service used, like Priority Mail or First-Class Mail, which helps you understand the expected delivery timeframe.
For your interest: Track Mail Uk Post Office

The middle nine digits serve as a unique package identifier, ensuring every shipment is distinguishable.
The final two letters function as check digits, verifying the validity of the tracking number and preventing errors in the system.
You can track a package using this number by entering it into the USPS tracking system online or through their mobile app, which will give you real-time updates on shipment status, location, and estimated delivery time.
Counting Digits in a Number
A USPS tracking number generally comprises 22 digits in a specific format. This format starts with two alphabetic characters, followed by nine numbers, and terminates with two more alphabetic characters.
The initial letter often corresponds to the mail service, such as Priority Mail or First-Class Mail. This helps identify the expected delivery timeframe.
It's essential to note that different USPS services may use varied tracking formats, yet the standard USPS Tracking number usually contains this 22-digit composition. This consistency makes it easier to track packages.
However, there are other formats of tracking numbers, such as those starting with 'C.P.' or 'E.P.' to indicate international shipments. These variations are less common but still valid tracking numbers.
Readers also liked: Speed Post Tracking Number Format
Understanding USPS Tracking

USPS Tracking is an essential tool for both senders and recipients of packages, allowing you to monitor your package's journey from dispatch to arrival.
Over 600 million packages are shipped annually through USPS, making tracking a crucial layer of transparency and assurance in the shipping process.
With USPS Tracking, you can monitor your package's journey, providing peace of mind for both senders and recipients.
The Anatomy of Numbers
USPS tracking numbers come in various formats, each corresponding to the type of mail or package service used. These formats range from a standard 22-digit number for USPS Tracking to a combination of letters and numbers for services like Priority Mail and Certified Mail.
The standard USPS Tracking number usually contains 22 digits in a specific format. This format starts with two alphabetic characters, followed by nine numbers, and terminates with two additional alphabetic characters, for example, 9400 1234, 5678 999,9 8765 00.
The initial letter of the tracking number corresponds to the mail service, such as Priority Mail or First-Class Mail. Different USPS services may use varied tracking formats, yet the standard USPS Tracking number usually contains this 22-digit composition.
USPS tracking numbers are usually located on the shipping label and can be entered into the USPS website or mobile app to access real-time tracking information.
Understanding
USPS Tracking is a vital tool for both senders and recipients of packages, allowing you to monitor your package's journey from dispatch to delivery.
Over 600 million packages are shipped annually through USPS, and tracking provides a layer of transparency and assurance in the shipping process.
The first step in understanding USPS Tracking is to know what a tracking number is and how it works. The tracking number is listed on the receipt you receive after submitting your package.
You can use this number to check your package's delivery status to the passport processing center, and even get the status of your application by visiting the USPS Online Passport Status System.
The first four or five digits of every tracking number signify the service code, which is a clue that shows the mail service that sent that specific item.
Here's a breakdown of some common service codes:
As your package travels, it will go through various hubs and distribution centers, and each time it's scanned, an update is logged in the system.
Types of USPS Services
USPS offers several types of tracking services to suit different shipping needs and budgets. These services include Priority Mail, First-Class Package Service, Priority Mail Express, and Media Mail.
Priority Mail provides delivery in 1-3 business days with tracking included. It's a great option for packages that need to arrive quickly.
First-Class Package Service is ideal for lightweight packages, offering tracking with delivery typically in 1-3 days. It's a cost-effective option for small packages.
Priority Mail Express offers overnight delivery to most U.S. locations, with tracking and a money-back guarantee. This service is perfect for packages that need to arrive as soon as possible.
Media Mail is a cost-effective option for shipping educational materials, books, and media with tracking available. It's a great choice for packages that don't need to arrive quickly.
Here's a summary of the services:
- Priority Mail: 1-3 business days, tracking included
- First-Class Package Service: 1-3 days, tracking included
- Priority Mail Express: Overnight, tracking and money-back guarantee
- Media Mail: Tracking available, cost-effective for educational materials
Tracking a Package
Tracking a package can be a frustrating experience, but with the right tools and knowledge, you can stay on top of your shipment's progress. The first step is to enter your tracking number on the USPS website or mobile app.

A tracking number typically consists of 20 characters, including both letters and numbers. You can find this number on the shipping label or in the confirmation email from the sender.
As the package moves through the mailstream, the USPS updates its status in real-time. This means you can check the tracking information multiple times a day to see if the package has been processed or shipped.
Typically, a package will go through several stages, including sorting, processing, and delivery. You can use the tracking number to see which stage the package is currently at.
By checking the tracking information regularly, you can get a better sense of when the package will arrive.
Package Delivery and Status
To decode a USPS tracking number, it's essential to understand the different status updates that occur during the package delivery process. The status updates on USPS tracking mean the following: Shipped indicates the package has been shipped and is on its way to the destination, while Arrived at Shipping Partner Facility means the package has reached a USPS partner facility.
Suggestion: Track Passport Speed Post Status
A key aspect of package delivery is the transit scans, which occur as the package travels through various hubs and distribution centers. Each time the package is scanned, an update is logged in the system, and this information is accessible to both the sender and recipient.
Here are the different status updates on USPS tracking:
Package Delivery and Status
Once your package is on its way, you can track its progress with ease. The final scan is the last update you'll see before it's delivered.
Your package will arrive at the destination USPS processing facility or post office, where it will be sorted and prepared for delivery.
Delivery Attempts and Issues
Delivery attempts can be frustrating, but understanding what they mean can help you stay on top of your package's journey. If a delivery attempt is made, it's usually indicated by a "Delivery Attempt" or "Delivery Scan" on the USPS tracking number.
For another approach, see: Walmart Order Online Delivery Tracking
This can happen multiple times, with up to 18 delivery attempts in some cases. If the delivery attempt is unsuccessful, the package may be left at a nearby post office or a neighbor's house.
The tracking number will also indicate if the package is held at a post office or if it's being returned to the sender.
How Long Does Information Last?
USPS keeps tracking info for a certain amount of time, depending on the mail class and service.
For Adult Signature Restricted or Adult Signature Required, Registered Mail Service, Numbered International Mail service, and Priority Mail Express Service, USPS keeps tracking info for 2 years.
Signature Confirmation Service has a shorter tracking record duration of 1 year.
Here's a breakdown of the tracking record duration for different mail services:
Delivered but Not Received
If your package says "Delivered" but it's nowhere to be found, don't panic. Sometimes, packages are left in unexpected spots or delivered by a different mail carrier.
Check all possible delivery spots around your house, including mailboxes, porches, garages, and even with neighbors. It's surprising how often packages end up in unusual locations.
Verify that your tracking status says "Delivered" and not "Out for Delivery" or "In Transit." You can do this through the USPS website, Google, or Informed Delivery account.
If you've thoroughly checked for your package and it's still missing, contact USPS. You can call the USPS Customer Care Center at 1-800-275-8777 during business hours or visit your local post office for quicker assistance.
Here's a step-by-step guide to help you resolve the issue:
- Check all possible delivery spots around your house.
- Verify your tracking status.
- Contact USPS for assistance.
Delivery Attempt
USPS typically makes delivery attempts once or twice at the carrier's discretion.
If the delivery can't be made, the package will be held for 15 days before being returned to the sender.
You'll see a "Delivery Attempt" status when USPS tries to deliver your package but can't.
This status can vary, but you can expect to see specific attempts listed.
Dead Mail/Sent to Recovery

If a package can't be delivered, forwarded, or returned, it's sent to the Postal Service's Mail Recovery Center in Atlanta, Georgia.
This center is responsible for reuniting undeliverable mail with its rightful owners.
USPS takes a serious approach to handling dead mail, and it's not just a matter of throwing it away.
Packages sent to recovery are carefully examined and processed to determine their fate.
Only then can they be returned to their senders, or potentially reunited with their intended recipients.
The Mail Recovery Center is a critical part of the USPS's efforts to keep track of lost mail.
Special Cases and Tips
If you're tracking a package from a US territory, be aware that some services may not be available, such as tracking for packages sent from Puerto Rico.
USPS tracking numbers starting with "PA" are for packages sent to Alaska or Hawaii, which may have different delivery times and procedures.
For packages sent from the US to a foreign country, the tracking number will display "International" or "Global Express Guaranteed", and you may need to use a different tracking tool or contact the destination country's postal service for updates.
For more insights, see: Track Us Mail to Canada
Package Delivery Tips
Double-checking the recipient's address is crucial to prevent delivery delays. Make sure it's accurate and complete to avoid any issues.
Using sturdy packaging is a must to protect your items during transit. This includes using appropriate materials that can withstand the conditions.
Purchasing insurance for valuable or fragile items is a good idea. It provides financial protection in case of loss or damage.
Opting for signature confirmation adds an extra layer of security. This ensures that your package is delivered to the right person.
Here are some best practices to keep in mind:
- Double-check the recipient's address.
- Use sturdy packaging.
- Purchase insurance.
- Opt for signature confirmation.
Keeping your tracking number accessible is essential. Retain it for reference and easier access to tracking information.
Can You Track a Passport?
You can track your passport through USPS by using the tracking number on the receipt you receive after submitting your application. This number will give you an update on when your application reaches the passport processing center.
You can check the status of your application on the USPS Online Passport Status System. Two weeks may pass before you can see any changes after applying.
Using the USPS Priority Mail Express option is a better choice than USPS Priority Mail if you want to speed up the process.
Frequently Asked Questions
What is the pattern for tracking numbers?
USPS tracking numbers typically follow a 20-digit format (e.g., 9999 9999 9999 9999 9999) or a 13-character combination starting with two letters, followed by nine digits, and ending with "US". The most common format is a combination of letters and numbers, such as EA 999 999 999 US.
Sources
- https://www.gocomet.com/blog/usps-tracking-number/
- https://mailomg.com/2018/09/19/usps-product-tracking-codes-what-they-mean/
- https://www.shipscience.com/understanding-usps-tracking-status-meanings-4-d34c1/
- https://www.postscanmail.com/blog/usps-tracking-how-to-use-it-and-how-to-find-tracking-number.html
- https://www.shipbob.com/blog/usps-tracking-status-meanings/
Featured Images: pexels.com