| Abbreviation | Definition |
|---|---|
| BM | British Mail |
| BMC | Bulk Mail Center |
| BMCC | Bulk Mail Center Container |
| BMEU | Business Mail Entry Unit |
| BN | Brunei Darussalam |
| BO | Bolivia |
| BPI | Business Process Improvement |
| BPM | Bound Printed Matter |
| BPO | Bermuda Post Office |
| BRM | Business Reply Mail |
| BS | Bahamas |
| BSA | Basic Street Address |
| BSMT | Basement |
| BT | Bhutan |
| BV | Bouvet Island |
| BW | Botswana |
| BY | Belarus |
| BZ | Belize |
| CA | CAnada |
| CAG | Cost Ascertainment Grouping |