Carrier Routes are subgroups of addresses within a ZIP code. There are more than 600,000 carrier routes in the United States, about half of them serving post office boxes. Each carrier route has a unique carrier route code.
Carrier Routes are subgroups of addresses within a ZIP code. There are more than 600,000 carrier routes in the United States, about half of them serving post office boxes. Each carrier route has a unique carrier route code.