| Abbreviation | Definition |
|---|---|
| KR | Korea (South) (Republic) |
| KW | Kuwait |
| KY | Cayman Islands |
| KZ | Kazakhstan |
| LA | Lane |
| LA | Laos |
| LACS | Locatable Address Conversion System |
| LAK | Lake |
| LB | Lebanon |
| LBBY | Lobby |
| LC | Saint Lucia |
| LC | Lettres et Cartes (Letters and Cards) |
| LCP | Letter Carrier Pre-sort |
| LCREM | Low-Cost Reject Encoding Machine |
| LCW | Letter Carrier Walk |
| LDC | Labor Distribution Code |
| LF | Lead Facilitator |
| LI | Liechtenstein |
| LID | Luminescent Indicia Detector |
| LK | Sri Lanka |