Couriers
USPS shipping refers to parcel delivery services provided by the United States Postal Service, both within the U.S. and internationally. Depending on the service selected, USPS offers different delivery speeds, packaging types, and price points. These services are often used by individuals and businesses to send letters, packages, and merchandise across the country or abroad.
Ship24 allows you to track any USPS shipment using just the tracking number, without needing to know which service or location it's associated with.

Tracking a USPS shipment through Ship24 is simple. Just enter your USPS tracking number into the Ship24 search bar. The system automatically detects the courier and retrieves tracking updates, including real-time location, status changes, and delivery confirmation.
You don’t need to sign up or select the courier manually. This helps you follow your package even if USPS hands it over to another carrier along the way.
Related:
USPS Media Mail Tracking USPS First Class Package Tracking USPS First Class Package International TrackingUSPS offers a range of domestic shipping services designed for letters, parcels, and merchandise. The table below compares the main options.
| Service | Delivery Time | Tracking | Package Limit |
|---|---|---|---|
| First-Class Mail® | 1–5 business days | Not included | Up to 13 oz |
| First-Class Package® | 1–3 business days | Included | Up to 16 oz |
| Priority Mail® | 1–3 business days | Included | Up to 70 lbs |
| Priority Mail Express® | Next-day to 2-day | Included | Up to 70 lbs |
| USPS Retail Ground® | 2–5 business days | Included | Up to 70 lbs |
| Media Mail® | 2–8 business days | Optional | Books, media items only |
Related:
USPS Support Phone Number USPS Priority Mail Express Tracking USPS Priority Mail Express International TrackingFor international delivery, USPS offers a mix of budget-friendly and expedited options. Delivery times vary by destination.
| Service | Estimated Delivery | Tracking | Notes |
|---|---|---|---|
| First-Class Mail International® | Varies | Not included | Letters & postcards only |
| First-Class Package International® | Varies | Included | Up to 4 lbs, <$400 value |
| Priority Mail International® | 6–10 business days | Included | Up to 70 lbs |
| Priority Mail Express International® | 3–5 business days | Included | Up to 70 lbs |
| Global Express Guaranteed® | 1–3 business days | Included | Fastest option, next-day to Canada |
When tracking your USPS shipment with Ship24, you’ll see real-time updates. Below are common USPS tracking notifications and what they mean:
If your shipment is delayed, lost, or marked as delivered but hasn’t arrived, here’s what you can do:
USPS Support Contacts:
Depending on the size and weight of your item, USPS offers different pricing models:
Flat Rate shipping is ideal for heavier items that can fit inside small or medium boxes, while Regional and Weight-based options are better for non-standard sizes.
Most USPS services include tracking, except First-Class Mail and some international services.
Delivery time depends on the service. Domestic shipments range from 1 to 8 days, while international deliveries can take 3 to 10+ days.
Yes. Ship24 provides tracking for both domestic and international USPS shipments using only the tracking number.
Check tracking updates. If needed, contact USPS or your country’s customs office. You may be required to pay tax or provide documentation.
For lightweight or flat-rate shipments, USPS is often more affordable than private carriers, especially for rural delivery areas.
Ship24 helps you stay informed about your USPS delivery from dispatch to delivery. With universal tracking that works across USPS and any third-party carriers involved, you’ll always have access to the latest status updates.