| Code | Name | Region |
|---|---|---|
| USL9N | London | AR |
| USLOZ | London | KY |
| USLDN | London | OH |
| USL4O | London Mills | IL |
| USLOD | Londonderry | NH |
| USOJY | Londonderry | PA |
| USLD8 | Londonderry | VT |
| USJKO | Lone Jack | MO |
| USPWW | Lone Pine | CA |
| USLNR | Lone Rock | WI |
| USLSX | Lone Star | TX |
| USDPL | Lodgepole | NE |
| USLDI | Lodi | CA |
| USLOI | Lodi | NJ |
| USLO7 | Lodi | NY |
| USLOC | Lodi | OH |
| USILO | Lodi | WI |
| USL4G | Logan | AL |
| USLG4 | Logan | MT |
| USOGN | Logan | OH |
| USLGU | Logan | UT |
| USOQN | Logan | WV |
| USYLO | Logan Township | NJ |
| USUZQ | Logan, Edgar | IL |
| USLGP | Logansport | IN |
| USOGP | Logansport | KY |
| USLST | Logansport | LA |
| USLGE | Loganville | GA |
| USL3G | Loganville | WI |
| US7OH | Lohman | MO |
| USLHQ | Lohrville | IA |
| USLCK | Lockbourne | OH |
| USLF8 | Lockeford | CA |
| USLQH | Lockhart | TX |
| USLKL | Lockland | OH |
| USLQY | Lockney | TX |
| USLOT | Lockport | IL |
| USLPT | Lockport | LA |
| USLOP | Lockport | NY |
| USLW9 | Lockwood | CA |
| USWOD | Lockwood | MO |
| US4LN | Lockwood | NV |
| USLH5 | Loco Hills | NM |
| USXLT | Locust | NJ |
| USLCZ | Locust Grove | GA |
| USXHN | Locust Grove | OK |
| USLHY | Locust Hill, Middlesex | VA |
| USXHY | Locust Summit | PA |
| USLEY | Locust Valley | NY |
| USLTV | Locustville | VA |