| Port Code | Port Name | Country |
| USLYA | Lynn | United States |
| USLYB | Lynbrook | United States |
| USLYC | Lynchburg | United States |
| USLYD | Linden | United States |
| USLYE | Lyme | United States |
| USLYF | Lynwood | United States |
| USLYG | Luling | United States |
| USLYH | Lynchburg | United States |
| USLYI | Lynn | United States |
| USLYJ | Lynwood | United States |
| USLYK | Little Neck/Queens/New York | United States |
| USLYL | Lynnville | United States |
| USLYN | Lynden | United States |
| USLYO | Lyons | United States |
| USLYP | Lemoyne | United States |
| USLYQ | Lyon Station | United States |
| USLYR | Lyerly | United States |
| USLYS | Lyons | United States |
| USLYT | Lytton | United States |
| USLYU | Ely | United States |
| USLYV | Livingston | United States |
| USLYW | Lynwood | United States |
| USLYX | Lynchburg | United States |
| USLYY | Lyons | United States |
| USLYZ | Lutts | United States |
| USLZB | Lisbon | United States |
| USLZG | Leesburg | United States |
| USLZI | Lisbon | United States |
| USLZK | Lindsay | United States |
| USLZN | Lynn | United States |
| USLZP | Lansford | United States |
| USLZV | Landing | United States |
| USLZW | Luverne | United States |
| USLZX | Lafayette | United States |
| USLZZ | Lenoir City | United States |
| USMAA | Mayo | United States |
| USMAB | Mandeville | United States |
| USMAC | Macon | United States |
| USMAD | Madawaska | United States |
| USMAE | Madera | United States |
| USMAF | Midland | United States |
| USMAG | Magnolia | United States |
| USMAH | Marcus Hook | United States |
| USMAI | Maida | United States |
| USMAJ | Mahopac | United States |
| USMAK | Marina | United States |
| USMAL | Malibu | United States |
| USMAM | Miamiville | United States |
| USMAN | Martin | United States |
| USMAO | Madison | United States |
| USMAP | Maple Heights | United States |
| USMAQ | Manor | United States |
| USMAR | Marrero | United States |
| USMAS | Mansfield | United States |
| USMAT | Mahrt | United States |
| USMAU | Mauldin | United States |
| USMAV | Manvel | United States |
| USMAW | Malden | United States |
| USMAX | Mexia | United States |
| USMAY | Mayfield | United States |
| USMAZ | Madison | United States |
| USMBA | Millbrae | United States |
| USMBB | Marlboro | United States |
| USMBC | Montoursville | United States |
| USMBD | Millsboro | United States |
| USMBE | Melbourne Beach | United States |
| USMBF | Merritt Island | United States |
| USMBG | Mobridge | United States |
| USMBH | Montrose | United States |
| USMBI | McBride | United States |
| USMBJ | Millbrook | United States |
| USMBK | Milbank | United States |
| USMBL | Manistee | United States |
| USMBM | Montville | United States |
| USMBN | Mebane | United States |
| USMBP | Mercersburg | United States |
| USMBQ | Manhattan Beach | United States |
| USMBR | Middlesboro | United States |
| USMBS | Midland-Bay City-Saginaw Apt | United States |
| USMBS | Saginaw-Midland-Bay City Apt | United States |
| USMBS | Bay City-Saginaw-Midland Apt | United States |
| USMBT | Millbury | United States |
| USMBU | Middlebury | United States |
| USMBV | Middleburgh Heights | United States |
| USMBW | Moore | United States |
| USMBX | Maben | United States |
| USMBY | Moberly | United States |
| USMBZ | Marlboro | United States |
| USMCA | McAdoo | United States |
| USMCB | McComb | United States |
| USMCC | McCrory | United States |
| USMCD | Mackinac Island | United States |
| USMCE | Merced | United States |
| USMCF | McFarland | United States |
| USMCG | McGrath | United States |
| USMCH | McDonough | United States |
| USMCI | Monticello | United States |
| USMCJ | Mishawaka | United States |
| USMCK | McCook | United States |
| USMCL | Mt McKinley | United States |