| Code | Name | Region |
|---|---|---|
| USLR9 | Loretto | MN |
| USQLT | Loretto | PA |
| USL9D | Long Pond | PA |
| USLLP | Long Prairie | MN |
| USLRC | Long Reach | WV |
| USLGJ | Long Valley | NJ |
| USL9K | Longboat Key | FL |
| USZLW | Longmeadow | MA |
| USLNG | Longmont | CO |
| USUNJ | Longport | NJ |
| USJNG | Longs | SC |
| USUFV | Longview | CA |
| USJLG | Longview | IL |
| USZLV | Longview | TX |
| USLOG | Longview | WA |
| USYZH | Longview Heights | TX |
| USLO4 | Longville | LA |
| USLGW | Longwood | FL |
| USL44 | Longwood | NC |
| USLOK | Lonoke | AR |
| US9LD | Lonsdale | AR |
| USLT5 | Lone Tree | CO |
| USLNI | Lonely | AK |
| USL7G | Long Barn | CA |
| USLGB | Long Beach | CA |
| USLBH | Long Beach | MS |
| USLB3 | Long Beach | NJ |
| USNGC | Long Beach | NY |
| USYBH | Long Beach | WA |
| USLCJ | Long Branch | NJ |
| USDYP | Long Eddy | NY |
| USLG5 | Long Green | MD |
| USLGG | Long Grove | IL |
| USLIJ | Long Island | AK |
| USYGI | Long Island | KS |
| USOZD | Long Island | ME |
| USLI4 | Long Island | VA |
| USXHO | Long Island City/queens/new York | NY |
| USLLE | Long Lake | MN |
| USLO3 | Long Lake | NY |
| USGQT | Long Mott | TX |
| USTZA | Loleta | CA |
| USOIT | Lolita | TX |
| USYOL | Lolo | MT |
| USLL3 | Loma Linda | CA |
| USLOM | Lombard | IL |
| USLTA | Lometa | TX |
| USXHR | Lomira | WI |
| USLOA | Lomita | CA |
| USLPC | Lompoc | CA |