Carrier Service Area Differences: USPS vs UPS/FedEx

Some physical addresses can be delivered by UPS or FedEx but are not recognized or serviced by USPS. This occurs due to differences in carrier service areas, not because the address is incorrect.

Understanding Carrier Service Area Differences

USPS and private carriers like UPS and FedEx operate different delivery networks with different service rules. Understanding these differences helps resolve delivery issues quickly.

Why USPS May Not Deliver to an Address

USPS only delivers to addresses within its official delivery database. Delivery may not be available in areas with:

• Mountainous or difficult terrain that limits daily delivery routes
• Private roads or gated communities without consistent access
• Rural locations where PO Boxes are required
• Seasonal access issues such as snow or flooding

In these cases, customers must use a PO Box for USPS delivery.

Why UPS and FedEx Can Deliver

Private carriers have more flexible delivery operations, including:

• GPS-based routing for non-standard locations
• Flexible delivery standards beyond USPS routes
• Package-focused logistics rather than daily mail routes

When This Issue Occurs

You’ll typically see this issue when:

• One carrier delivers successfully while another marks it undeliverable
• USPS validation fails even though the address appears correct
• Customers provide valid physical addresses that only work with UPS/FedEx
• The address is rural or remote where USPS requires a PO Box

Common Scenarios

Scenario 1: A split shipment—UPS delivers successfully, but USPS returns the package as undeliverable.

Scenario 2: Address validation suggests corrections, but USPS still cannot deliver due to service limitations.

Scenario 3: The address is correct, but USPS marks it invalid because the location is not serviced.

How to Handle These Orders

For Label Software Sellers (Self-Shipping)

If USPS fails but UPS works:

Step 1: Check if the address is rural or remote using the USPS Location Finder .

Step 2: If USPS does not service the address, select UPS or FedEx when creating the label.

Step 3: Contact the customer to request a PO Box if USPS delivery is required.

For Network Sellers (Cahoot Fulfillment)

If a USPS label is created but delivery fails:

Step 1: Void the label and remove the order using the Remove Orders from Cahoot Fulfillment process.

Step 2: Contact the customer to request a PO Box or approval to ship via UPS/FedEx.

Step 3: Update the address and reset the order to generate a new label with a supported carrier.

If the package is already in transit, contact the carrier for interception or allow it to return to the Cahoot Returns Location.