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| Name | Entry in The World Factbook | |
| Mexico, Gulf of | Atlantic Ocean | |
| Milan [US Consulate General] | Italy | |
| Minami-tori-shima | Japan | |
| Mindanao | Philippines | |
| Mindoro Strait | Pacific Ocean | |
| Minicoy Island | India | |
| Mogadishu [US Embassy] | Somalia | |
| Mombasa [US Consulate] | Kenya | |
| Mona Passage | Atlantic Ocean | |
| Monrovia [US Embassy] | Liberia | |
| Montego Bay [US Consular Agency] | Jamaica | |
| Monterrey [US Consulate General] | Mexico | |
| Montevideo [US Embassy] | Uruguay | |
| Montreal [US Consulate General, US Mission to the International Civil Aviation Organization (ICAO)] | Canada | |
| Moravian Gate | Czechoslovakia | |
| Moroni [US Embassy] | Comoros | |
| Mortlock Islands | Micronesia, Federated States of | |
| Moscow [US Embassy] | Soviet Union | |
| Mozambique Channel | Indian Ocean | |
| Mulege [US Consular Agency] | Mexico | |
| Munich [US Consulate General] | Federal Republic of Germany | |
| Musandam Peninsula | Oman; United Arab Emirates | |
| Muscat [US Embassy] | Oman | |
| Muscat and Oman | Oman | |
| Myanma or Myanmar | Burma | |
| N | Naha [US Consulate General] | Japan |
| Nairobi [US Embassy] | Kenya | |
| Nampō-shotō | Japan | |
| Naples [US Consulate General] | Italy | |
| Nassau [US Embassy] | Bahamas, The | |
| Natuna Besar Islands | Indonesia | |
| N'Djamena [US Embassy] | Chad | |
| Netherlands East Indies | Indonesia | |
| Netherlands Guiana | Suriname | |
| Nevis | St. Kitts and Nevis | |
| New Delhi [US Embassy] | India | |
| Newfoundland | Canada | |
| New Guinea | Indonesia; Papua New Guinea | |
| New Hebrides | Vanuatu | |
| New Siberian Islands | Soviet Union | |
| New Territories | Hong Kong | |
| New York, New York [US Mission to the United Nations (USUN)] | United States | |
| Niamey [US Embassy] | Niger | |
| Nice [US Consular Agency] | France | |
| Nicobar Islands | India | |
| Nicosia [US Embassy] | Cyprus | |
| Nightingale Island | St. Helena | |
| North Atlantic Ocean | Atlantic Ocean | |
| North Channel | Atlantic Ocean | |
| Northeast Providence Channel | Atlantic Ocean | |
| Northern Epirus | Albania; Greece | |
| Northern Grenadines | St. Vincent and the Grenadines | |
| Northern Ireland | United Kingdom | |
| Northern Rhodesia | Zambia | |
| North Island | New Zealand | |
| North Korea | Korea, North | |
| North Pacific Ocean | Pacific Ocean | |
| North Sea | Atlantic Ocean | |
| North Vietnam | Vietnam | |
| Northwest Passage | Arctic Ocean |
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