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| Name | Entry in The World Factbook | |
| Louisiade Archipelago | Papua New Guinea | |
| Loyalty Islands (Îles Loyauté) | New Caledonia | |
| Lubumbashi [US Consulate General] | Zaire | |
| Lusaka [US Embassy] | Zambia | |
| Luxembourg [US Embassy] | Luxembourg | |
| Luzon | Philippines | |
| Luzon Strait | Pacific Ocean | |
| Lyon [US Consulate General] | France | |
| M | Macao | Macau |
| Macedonia | Bulgaria; Greece; Yugoslavia | |
| Macquarie Island | Australia | |
| Madeira Islands | Portugal | |
| Madras [US Consulate General] | India | |
| Spain | ||
| Magellan, Strait of | Atlantic Ocean | |
| Mahé Island | Seychelles | |
| Maíz, Islas del (Corn Islands) | Nicaragua | |
| Majorca (Mallorca) | Spain | |
| Majuro [US Special Office] | Marshall Islands | |
| Makassar Strait | Pacific Ocean | |
| Malabo [US Embassy] | Equatorial Guinea | |
| Malacca, Strait of | Indian Ocean | |
| Malaga [US Consular Agency] | Spain | |
| Malagasy Republic | Madagascar | |
| Male [US post not maintained, representation from Colombo, Sri Lanka] | Maldives | |
| Mallorca (Majorca) | Spain | |
| Malpelo, Isla de | Colombia | |
| Malta Channel | Atlantic Ocean | |
| Malvinas, Islas | Falkland Islands (Islas Malvinas) | |
| Managua [US Embassy] | Nicaragua | |
| Manama [US Embassy] | Bahrain | |
| Manaus [US Consular Agency] | Brazil | |
| Manchukuo | China | |
| Manchuria | China | |
| Manila [US Embassy] | Philippines | |
| Manipa Strait | Pacific Ocean | |
| Mannar, Gulf of | Indian Ocean | |
| Manua Islands | American Samoa | |
| Maputo [US Embassy] | Mozambique | |
| Maracaibo [US Consulate] | Venezuela | |
| Marcus Island (Minami-tori-shima) | Japan | |
| Mariana Islands | Guam; Northern Mariana Islands | |
| Marion Island | South Africa | |
| Marmara, Sea of | Atlantic Ocean | |
| Marquesas Islands (Îles Marquises) | French Polynesia | |
| Marseille [US Consulate General] | France | |
| Martin Vaz, Ilhas | Brazil | |
| Más a Tierra (Robinson Crusoe Island) | Chile | |
| Mascarene Islands | Mauritius; Reunion | |
| Maseru [US Embassy] | Lesotho | |
| Matamoros [US Consulate] | Mexico | |
| Mazatlan [US Consulate] | Mexico | |
| Mbabane [US Embassy] | Swaziland | |
| McDonald Islands | Heard Island and McDonald Islands | |
| Medan [US Consulate] | Indonesia | |
| Mediterranean Sea | Atlantic Ocean | |
| Melbourne [US Consulate General] | Australia | |
| Melilla | Spain | |
| Merida [US Consulate] | Mexico | |
| Messina, Strait of | Atlantic Ocean | |
| Mexico [US Embassy] | Mexico |
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