United States Postal Service Tracking Number Official Guide
Editorial Team · on 18 July 2026 · 13 min read · Last reviewed 18 July 2026
United states postal service tracking number guide is the focus here. A United States Postal Service (USPS) tracking number is a unique identifier assigned to packages and mail to monitor their progress through the USPS delivery network.
In plain terms: Think of it as a passport for your package, allowing both you and USPS to track its journey from sender to recipient.
Key facts
- USPS tracking numbers are typically 22 digits long and begin with two letters
- They are assigned to packages sent via USPS Retail Ground, First Class Package, Priority Mail, and other trackable services
- Tracking information is updated in real-time as the package moves through the USPS system
- According to USPS, over 400 million packages are tracked daily using these numbers
United States Postal Service tracking number guide
To locate your USPS tracking number, check the receipt you received when you shipped your package, or look for the email or text confirmation from USPS if you shipped it online. If you used a USPS-approved retailer, your tracking number may be included in their shipping confirmation.
The tracking number is usually a combination of letters and numbers, such as “9400 1000 0000 0000 0000 00” or “EC 000 000 000 US”. The first few characters indicate the mail service and the origin of the shipment. For example, “94” indicates Priority Mail, while “EC” stands for USPS Ground Advantage, a new domestic shipping service launched in 2023.
If you still can’t find your tracking number, contact the sender or the USPS customer service at 1-800-275-8777 for assistance. In my experience, USPS customer service is most helpful when you have as much information as possible, such as the sender’s address, recipient’s address, and the estimated shipping date.
What information can I track with a United States Postal Service tracking number?
With a USPS tracking number, you can monitor the status and location of your package throughout its journey. This includes tracking key milestones, such as when the package is picked up, processed at a USPS facility, in transit, out for delivery, and finally delivered.
| Status | Description | Typical Duration |
|---|---|---|
| Pre-Shipment | The package is not yet in the USPS system | Varies |
| In Transit | The package is moving through the USPS network | 1-7 days (domestic), 7-21 days (international) |
| Out for Delivery | The package is with the delivery person | Same day |
| Delivered | The package has been delivered to the recipient | N/A |
| Return to Sender | The package could not be delivered and is being sent back to the sender | Varies |
How does the United States Postal Service tracking number system work?
The USPS tracking system is a complex network of barcodes, scanners, and databases that work together to update the status of packages in real-time. When a package is shipped, its tracking number is entered into the USPS system, which generates a barcode for the package. This barcode is scanned at various points along the package’s journey, updating its status and location in the system.
For example, when a package is processed at a USPS facility, its barcode is scanned to record its arrival. As it moves through the facility, it may be scanned again to record its sorting and routing. This information is then updated in the USPS tracking database, allowing both the sender and recipient to monitor the package’s progress.
In the rare event that a tracking number does not update, it could be due to a scanning error, a delay in processing, or a problem with the USPS system. If your tracking information has not updated in several days, you should contact USPS customer service for assistance. According to USPS, less than 1% of tracking numbers experience significant delays or errors.
What are the different types of United States Postal Service tracking numbers?
USPS uses several types of tracking numbers, depending on the mail service and the origin of the shipment. The most common types are:
- Domestic tracking numbers: These are used for packages shipped within the United States. They typically start with two letters, such as “94” for Priority Mail or “EC” for USPS Ground Advantage.
- International tracking numbers: These are used for packages shipped to other countries. They typically start with two letters and a series of numbers, such as “CP” for Priority Mail International or “CR” for First Class Package International Service.
- Electronic USPS Confirmation numbers: These are used for certain mail classes, such as First Class Mail and Standard Post. They typically start with “EC” or “CP” and are generated electronically.
| Tracking Number Format | Mail Service | Example |
|---|---|---|
| 22 digits, starts with 2 letters | Priority Mail, USPS Retail Ground, First Class Package Service | 9400 1000 0000 0000 0000 00 |
| 13 characters, starts with 2 letters and “US” | Priority Mail International, First Class Package International Service | CP 000 000 US |
| 9 characters, starts with “EC” or “CP” | USPS Ground Advantage, First Class Mail | EC 000 000 00 |
How can I track my United States Postal Service package without a tracking number?
If you don’t have a tracking number, you can still track your USPS package using the Informed Delivery service. This free service provided by USPS allows you to view grayscale images of the exterior, address side of letter-sized mail pieces and track packages.
To use Informed Delivery, you’ll need to sign up for a free USPS account and enroll in the service. Once enrolled, you’ll receive daily digests of your mail pieces and package tracking information. This service is particularly useful for tracking packages sent via USPS First Class Mail, Standard Post, or other mail classes that do not typically include a tracking number.
Should you be awaiting a package without a tracking number, consider reaching out to the sender or USPS customer service for help. In my experience, USPS customer service is most helpful when you have as much information as possible, such as the sender’s address, recipient’s address, and the estimated shipping date.
What should I do if my United States Postal Service tracking number is not updating?
When your USPS tracking number is not updating, several troubleshooting steps can be taken. First, check the USPS service alerts page for any known outages or delays in your area. You can also try refreshing the tracking page or using a different browser or device.
Should the tracking information remain unchanged, reach out to USPS customer service for help. They can help you determine if there is an issue with the tracking system or if there is a problem with your package. According to USPS, less than 1% of tracking numbers experience significant delays or errors. If your package is lost or damaged, USPS may be able to provide a refund or compensation, depending on the mail service and the value of the contents.
In some cases, the tracking information may be delayed due to a scanning error or a delay in processing. For example, if your package is in transit but has not been scanned, the tracking information may not update until the next scan. If your package is expected to arrive soon but the tracking information has not updated, you can contact the sender or the recipient to confirm that the package has been received.
Key steps to take if your tracking number is not updating:
- Check the USPS service alerts page for known outages or delays
- Refresh the tracking page or try using a different browser or device
- Contact USPS customer service for assistance
- Check with the sender or recipient to confirm that the package has been received
- If necessary, file a claim for a lost or damaged package
What is the difference between a United States Postal Service tracking number and a USPS label?
A USPS tracking number is a unique identifier assigned to a package or mail piece to monitor its progress through the USPS delivery network. A USPS label, on the other hand, is a physical or digital label that contains the recipient’s address, the sender’s address, and other shipping information. The label also typically includes a barcode that can be scanned to update the package’s tracking information.
In some cases, you may be able to create a USPS label without a tracking number, such as when using USPS First Class Mail or Standard Post. However, these mail classes typically do not include tracking information. To get a tracking number, you’ll need to use a trackable mail service, such as USPS Priority Mail, USPS Retail Ground, or First Class Package Service.
If you’re using a USPS-approved retailer, such as Post Office Official Locations and Service Hours or Libraries Official Public Access and Digital Resources, you can purchase a label and tracking number online. These retailers typically offer a range of shipping options and services, including tracking and insurance. When purchasing a label, be sure to select a trackable mail service to get a tracking number.
What are the benefits of using a United States Postal Service tracking number?
Using a USPS tracking number provides the capacity to observe the status and whereabouts of your package during its transit. This is particularly useful when sending valuable or time-critical items. Tracking numbers can also assist you in:
- Confirm that your package has been delivered
- Identify any delays or issues in transit
- Provide proof of delivery for insurance or legal purposes
- Track international shipments and manage customs clearance
In addition to tracking, USPS offers a range of other services to help you manage your shipments. For example, you can use the USPS Informed Delivery service to view grayscale images of your mail pieces and track packages. You can also use the USPS Package Pickup service to schedule a free package pickup from your home or business.
When shipping internationally, USPS provides various customs forms and services to assist with the clearance process. For example, you can use the USPS Click-N-Ship service to create and print customs forms online. You can also use the USPS International Mail Manual to learn more about shipping restrictions, customs requirements, and other important information.
How can I print my United States Postal Service tracking number?
To print your USPS tracking number, you’ll need to access your shipping receipt or the electronic shipping confirmation you received when you shipped your package. If you shipped your package online, you can typically find your tracking number in your email confirmation or in your account history.
To print your tracking number, follow these steps:
- Locate your shipping receipt or electronic shipping confirmation
- Highlight the tracking number and copy it to your clipboard
- Open a new document in a word processing program, such as Microsoft Word or Google Docs
- Paste the tracking number into the document
- Print the document using your printer
To print a label with your tracking number, use the USPS Click-N-Ship service for online creation and printing. This service allows you to create labels for a range of mail services, including Priority Mail, First Class Package Service, and USPS Retail Ground. When creating your label, be sure to select the correct mail service and enter the correct recipient and sender information.
If you’re using a USPS-approved retailer, such as Post Office Official Locations and Service Hours or Libraries Official Public Access and Digital Resources, you can also purchase and print labels online. These retailers typically offer a range of shipping options and services, including tracking and insurance. When purchasing a label, be sure to select a trackable mail service to get a tracking number.
What is the difference between a United States Postal Service tracking number and a USPS reference number?
A USPS tracking number is a unique identifier assigned to a package or mail piece to monitor its progress through the USPS delivery network. A USPS reference number, on the other hand, is an additional identifier that you can add to your package to help you organize and track your shipments.
Reference numbers are typically used by businesses or individuals who ship multiple packages and need a way to organize and track their shipments. For example, you can use a reference number to track an order number, a customer name, or a project code. When you add a reference number to your package, it will appear in the tracking information along with the tracking number.
To add a reference number to your package, you can use the USPS Click-N-Ship service to create and print a label online. When creating your label, you’ll have the option to add a reference number in the “Reference” field. Be sure to enter the correct reference number and select the correct reference type, such as “Order Number” or “Customer Name.”
If you’re using a USPS-approved retailer, such as Post Office Official Locations and Service Hours or Libraries Official Public Access and Digital Resources, you can also add a reference number to your package when purchasing a label online. These retailers typically offer a range of shipping options and services, including tracking and reference numbers. When purchasing a label, be sure to select a trackable mail service to get a tracking number and add a reference number if needed.
How can I track multiple United States Postal Service tracking numbers at once?
To track multiple USPS tracking numbers simultaneously, use the USPS Tracking page to enter up to 35 tracking numbers at once. To do this, follow these steps:
- Go to the USPS Tracking page at https://tools.usps.com/go/TrackConfirmAction_input
- Enter up to 35 tracking numbers, one per line
- Click the “Track” button to view the tracking information for all of your packages
If you need to track more than 35 tracking numbers at once, you can use a third-party tracking service or software. These services typically allow you to enter multiple tracking numbers at once and provide advanced tracking features, such as email notifications, delivery alerts, and reporting tools. Some popular third-party tracking services include Post Office Official Locations and Service Hours and Libraries Official Public Access and Digital Resources.
If you’re a business or individual who ships multiple packages on a regular basis, you may want to consider using a USPS-approved shipping software or platform. These tools typically offer advanced tracking features, such as batch tracking, email notifications, and reporting tools. Some popular USPS-approved shipping software and platforms include Post Office Official Locations and Service Hours and Libraries Official Public Access and Digital Resources.
Key steps to track multiple USPS tracking numbers at once:
- Go to the USPS Tracking page at https://tools.usps.com/go/TrackConfirmAction_input
- Enter up to 35 tracking numbers, one per line
- Click the “Track” button to view the tracking information for all of your packages
- If you need to track more than 35 tracking numbers, use a third-party tracking service or software
- If you’re a business or individual who ships multiple packages on a regular basis, consider using a USPS-approved shipping software or platform
What should I do if my United States Postal Service package is lost or damaged?
When your USPS package is lost or damaged, begin by reaching out to USPS customer service for help. You can file a claim online or by calling 1-800-275-8777. To file a claim, you’ll need to provide information about your package, such as the tracking number, the date of shipment, and the value of the contents. You’ll also need to provide proof of insurance or a certificate of mailing if you purchased these services.
According to USPS, the claims process typically takes 5-10 business days to complete. If your claim is approved, you’ll receive a refund for the cost of the package and any insurance coverage you purchased. If your package is damaged but still deliverable, you may be able to file a claim for the cost of repair or replacement. If your package is lost or cannot be delivered, you may be able to file a claim for the full value of the contents.
Frequently asked questionsHow do I find my USPS tracking number?
Check the receipt after dropping off your package. If shipping online, the confirmation email contains the tracking number. No receipt? Contact the sender or USPS with shipment details for assistance.
What do the status updates mean in USPS tracking?
Statuses like 'In Transit' mean your package is moving between facilities. 'Out for Delivery' indicates it’s on a truck headed to your address. 'Delivered' confirms arrival, usually with a timestamp and location.
Can I track a package without a tracking number?
No. USPS requires a tracking number to monitor packages. If you lack one, request it from the sender or check your online shipping confirmation. USPS doesn’t track packages by sender or recipient details alone.
Why isn’t my USPS tracking number updating?
Delays often stem from high mail volume or scanning backlogs. Wait 24 hours; updates usually appear within a day. Persistent issues? Contact USPS with your tracking number and details.
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