US ambassadorships but not UN member states
- African Union
- ASEAN
- EU
- Vatican City
- ICAO (International Civil Aviation Org)
- Kosovo
- NATO
- OAS
- OECD
- OPCW (Org for the Prohibition of Chemical Weapons)
- OSCE (Org for Security and Cooperation in Europe)
- UN
- UN Conference on Disarmament
- UN Deputy Representative
- UN Economic & Social Council
- UN Geneva
- UN Human Rights Council
- UN Management & Reform
- UN Political Affairs
- UN Rome
- UN Vienna
- UNESCO
UN member states but no US ambassadors
- Antigua and Barbuda
- Bhutan
- North Korea
- Dominica
- Grenada
- Iran
- Saint Kitts and Nevis
- Saint Lucia
- Saint Vincent and the Grenadines
US ambassadors for multiple states
- Fiji/Kiribati/Nauru/Tonga/Tuvalu
- France/Monaco
- Gabon/Sao Tome & Principe
- Italy/San Marino
- Madagascar/Comoros
- Mauritius/Seychelles
- New Zealand/Samoa
- Papua New Guinea/Solomon Islands/Vanuatu
- Senegal/Guinea-Bissau
- Spain/Andorra
- Sri Lanka/Maldives
- Switzerland/Liechtenstein