When USPS tracking is not working, the cause is usually one of four things: a mistyped or incomplete tracking number, a label USPS hasn’t scanned yet, a temporary problem with the USPS.com tracking tool itself, or a number that belongs to a different carrier. Each has a quick check, and only a package that has shown no movement for 7 days or more needs a formal USPS Missing Mail search.
This guide is about the tracking tool failing: error messages, “Status Not Available,” pages that won’t load, or a number USPS says it doesn’t recognize. If your number works but the history just hasn’t changed for a while, our guide to USPS tracking that’s stopped updating covers stalled packages in detail.
Why Is USPS Tracking Not Working?
USPS tracking only shows what’s been scanned into the system, so “not working” can mean the tool has nothing to display yet or that it can’t reach the data at all. The fastest way to fix it is to match the symptom you’re seeing to its likely cause.
| What you see | Most likely cause | First thing to try |
|---|---|---|
| “Status Not Available” or number not found | Typo, missing digits, or label not yet scanned | Re-copy the full number; wait 24 hours after the label was created |
| “Label Created, not yet in system” | Sender printed a label, but USPS hasn’t received the package | Check again after the sender’s drop-off or pickup |
| Page won’t load, spins or shows a site error | Browser problem or a USPS.com outage | Try another browser, device or the USPS app |
| Number works on another carrier’s site | Package wasn’t shipped with USPS | Track it with the carrier that issued the number |
| Tracking loads but hasn’t changed in days | Missed scans or a delay in transit | Wait it out, then contact USPS after 7 days with no movement |
How Do You Fix USPS Tracking When It’s Not Working?
Work through these checks in order. Most tracking problems clear up at the first or second step, and none of them requires calling USPS.
1. Check the tracking number itself
Copy and paste the number from the shipping email or receipt instead of typing it, and make sure you have every character. Most domestic USPS tracking numbers are long strings of 20 to 22 digits, while international items use 13 characters that start with two letters and end in “US.” A single missing or swapped digit returns an error rather than someone else’s package. Our USPS tracking ID lookup guide explains where to find the number on a receipt and what each format looks like.
2. Give a new label time to enter the system
A tracking number exists as soon as a label is printed, but USPS doesn’t have anything to show until the package gets its first scan. If the seller just created the label, “Label Created, not yet in system” or “Status Not Available” is normal until they drop it off or the carrier picks it up. Packages left in a collection box or at a mailbox often get their first scan at the processing plant rather than at drop-off, which our guide on tracking after drop-off explains.
3. Rule out your browser or device
If the USPS tracking page won’t load, spins forever or throws an error, try a private browsing window, a different browser, or clear your cache. Switching between Wi-Fi and mobile data, or trying the USPS Mobile app, also tells you quickly whether the problem is on your end.
4. Check whether USPS.com is having problems
When the page fails on every device, the USPS website or tracking system itself may be down for maintenance or an outage. These usually clear within hours; our guide to what to do when USPS tracking is down covers how to tell. USPS’s technical support line, 1-800-344-7779, handles problems with USPS.com tools.
5. Try another way to look up the same data
USPS offers other ways to see the same scans. You can text your tracking number to 28777 (2USPS) for text updates, sign up for email alerts from the tracking page, or use Informed Delivery, which lists packages headed to your address. Third-party package tracking services pull from the same USPS feed, so they won’t show scans USPS doesn’t have, but they can help when the USPS page itself won’t load.
6. Confirm the package was shipped with USPS
Sellers sometimes send a number from a different carrier, and USPS.com won’t recognize it. A UPS number typically starts with “1Z,” and FedEx numbers have their own formats; if USPS can’t find the number, paste it into the issuing carrier’s site. Our FedEx shipping and tracking guide covers FedEx lookups, and our comparison of major shipping companies lists the main carriers.
7. Contact USPS if the package still has no scans
If the number is correct, the tool works, and the package has gone 7 days or more without any update, it’s time to reach USPS. Call the tracking line at 1-800-222-1811 or 1-800-ASK-USPS (1-800-275-8777) on weekdays from 8 AM to 8:30 PM ET or Saturdays from 8 AM to 6 PM ET, or submit a Missing Mail search online. USPS notes that phone agents see the same tracking information you see online.
What Do USPS Tracking Error Messages Mean?
A few messages account for most “tracking isn’t working” reports, and each one means something specific about where the package is in the USPS system.
- Status Not Available: USPS has no scans tied to the number yet, or the number was entered incorrectly.
- Label Created, not yet in system: a label exists, but USPS hasn’t physically received or scanned the package.
- In Transit, Arriving Late: the package is moving but has fallen behind its expected delivery date.
- Tracking number not found: usually a typo, a number from another carrier, or a label that was never used.
Our complete USPS tracking guide explains every status in order, from acceptance through delivery.
When Should You Contact USPS About Tracking?
Contact USPS once you’ve ruled out a bad number and a website problem and the package still shows no progress. Have the tracking number, mailing date, both addresses and a description of the package and its contents ready.
| Channel | Best for | Details |
|---|---|---|
| Tracking line: 1-800-222-1811 | Questions about a specific tracking number | Weekdays 8 AM–8:30 PM ET, Saturday 8 AM–6 PM ET |
| Customer Care: 1-800-275-8777 | General delivery problems | Same hours |
| Technical support: 1-800-344-7779 | USPS.com tools or account not working | Same hours |
| Missing Mail search | No movement for 7+ days | Online at missingmail.usps.com, from day 7 after mailing |
Our customer support overview covers what to have ready before you call, and if a search comes up empty, an insurance claim must be filed within 60 days of mailing.
How Can You Avoid Tracking Problems on Packages You Send?
As a sender, you can head off most tracking trouble before the package leaves. Hand packages to a Post Office clerk or schedule a carrier pickup so they get an acceptance scan right away, and send the recipient the full tracking number with a note on which carrier it belongs to.
Choosing the right service also sets expectations: our guide to how long Priority Mail takes lists the delivery windows that tracking estimates are built on. Our overview of USPS shipping services and tracking compares the services side by side.
Every USPS and UPS label you buy through ParcelPath comes with that carrier’s tracking number, and ParcelPath is free to use, with up to 89% off USPS and up to 85% off UPS. You can schedule free USPS pickups so packages are scanned at the door, and compare live rates for your package in the ParcelPath rate calculator. Our shipping calculator guide explains how the rate comparison works.
Frequently Asked Questions
Why does USPS say my tracking number is not available?
“Status Not Available” usually means USPS has no scans tied to the number yet. That’s normal right after a seller prints a label and before they drop the package off. It can also mean the number was mistyped. Re-copy the full number from the shipping email, and if it still shows nothing after 24 to 48 hours, ask the sender whether the package was actually mailed.
What phone number do I call when USPS tracking isn’t working?
Call 1-800-222-1811, the USPS domestic and international tracking line, or 1-800-ASK-USPS (1-800-275-8777). Both are staffed weekdays 8 AM to 8:30 PM ET and Saturdays 8 AM to 6 PM ET. If the USPS.com tracking tool itself is broken, USPS’s technical support line is 1-800-344-7779 during the same hours.
Can I track a USPS package by text message?
Yes. Text your USPS tracking number to 28777 (2USPS) and USPS replies with the latest tracking status, which is useful when the website won’t load. You can also sign up for text or email alerts from the USPS tracking page, or use Informed Delivery to see packages scheduled to arrive at your address.
When should I file a USPS Missing Mail search?
USPS accepts Missing Mail search requests starting 7 days after the mailing date, at missingmail.usps.com. You’ll need the sender and recipient addresses, the tracking number or receipt, the package type and size, and a description of the contents. USPS emails periodic updates while it searches, and insurance claims must be filed within 60 days of mailing.
Sources
- USPS: Contact Us (tracking, customer care and technical support lines)
- USPS: Missing Mail
- USPS Tracking
Part of our USPS Tracking guide. Related: USPS Tracking and Delivery, USPS Tracking Not Updating, USPS Tracking Not Updating After Drop Off.
