Afghanistan
Albania
Anguilla
Antigua and Barbuda
Argentina
Aruba
Australia
Azerbaijan
Bahamas
Barbados
Belgium
Belize
Benin
Bermuda
Bhutan
Bolivia
Brazil
British Indian Ocean Territories
British Virgin Islands
Brunei
Burkina Faso
Cabo Verde
Cameroon
Cayman Islands
Central African Republic
Chile
Cook Islands
Costa Rica
Croatia
Cuba
Curacao
Cyprus
Djibouti
Dominica
Dominican Republic
Egypt
El Salvador
Eritrea
Ethiopia
French Guiana
French Polynesia
French Southern and Antarctic Lands
Gambia
Gaza
Georgia
Ghana
Gibraltar
Grenada
Guadeloupe
Guatemala
Guinea
Giunea-Bissau
Guyana
Haiti
Honduras
Hong Kong
Iran
Jamaica
Jordan
Kiribati
Kosovo
Kuwait
Kyrgyzstan
Lebanon
Liberia
Luxembourg
Macau
Maldives
Mali
Malta
Marshall Islands
Martinique
Mauritania
Mayotte
Micronesia
Mongolia
Montenegro
Montserrat
Morocco
Mozambique
Netherlands
Niger
Norway
Oman
Palau
Panama
Paraguay
Peru
Qatar
Rwanda
Samoa
Sao Tome and Principe
Senegal
Seychelles
Sierra Leone
Singapore
Sint Maarten
Solomon Islands
Somalia
South Sudan
St. Kitts and Nevis
St. Lucia
St. Pierre and Miquelon
St. Vincent and the Grenadines
Sudan
Suriname
Svalbard, Jan Meyen Island
Swaziland
Tajikistan
Tanzania
Togo
Tonga
Tunisia
Turkey
Turkmenistan
Turks and Caicos
Tuvalu
Uganda
Ukraine
United Arab Emirates
United Kingdom
Uruguay
Uzbekistan
Vanuatu
Vatican City
Wallis and Futuna
Western Sahara
Yemen
Zambia

Source: https://www.census.gov/foreign-trade/Press-Release/2017pr/12/exh4s.pdf