These images below may be out of date if USPS has updated their site. Follow these instructions to get the carrier route of a specific address.
Visit USPS.com. Mouseover "Quick Tools". Click "Look Up a ZIP Code".
Click "Find by Address".
Enter the address and click "Find".
USPS will return the address with the ZIP+4. Click the down arrow to view address details.
The carrier route will be included in the address details.