The number of countries that the United States has a presence in is staggering. According the U.S. Department of State’s list of "Independent States in the World," there are 192 countries in the world, all of which, except Bhutan, Cuba, Iran, and North Korea, have diplomatic relations with the United States. All of these countries except one (Vatican City) are members of the United Nations. According to the Department of Defense publication, "Active Duty Military Personnel Strengths by Regional Area and by Country," the United States has troops in 135 countries. Here is the list:
Afghanistan
Albania
Algeria
Antigua
Argentina
Australia
Austria
Azerbaijan
Bahamas
Bahrain
Bangladesh
Barbados
Belgium
Belize
Bolivia
Bosnia and Herzegovina
Botswana
Brazil
Bulgaria
Burma
Burundi
Cambodia
Cameroon
Canada
Chad
Chile
China
Colombia
Congo
Costa Rica
Cote D’lvoire
Cuba
Cyprus
Czech Republic
Denmark
Djibouti
Dominican Republic
East Timor
Ecuador
Egypt
El Salvador
Eritrea
Estonia
Ethiopia
Fiji

Finland
France
Georgia
Germany
Ghana
Greece
Guatemala
Guinea
Haiti
Honduras
Hungary
Iceland
India
Indonesia
Iraq
Ireland
Israel
Italy
Jamaica
Japan
Jordan
Kazakhstan
Kenya
Kuwait
Kyrgyzstan
Laos
Latvia
Lebanon
Liberia
Lithuania
Luxembourg
Macedonia
Madagascar
Malawi
Malaysia
Mali
Malta
Mexico
Mongolia
Morocco
Mozambique
Nepal
Netherlands
New Zealand
Nicaragua
Niger
Nigeria
North Korea
Norway
Oman
Pakistan
Paraguay
Peru
Philippines
Poland
Portugal
Qatar
Romania
Russia
Saudi Arabia
Senegal
Serbia and Montenegro
Sierra Leone
Singapore
Slovenia
Spain
South Africa
South Korea
Sri Lanka
Suriname
Sweden
Switzerland
Syria
Tanzania
Thailand
Togo
Trinidad and Tobago
Tunisia
Turkey
Turkmenistan
Uganda
Ukraine
United Arab Emirates
United Kingdom
Uruguay
Venezuela
Vietnam
Yemen
Zambia
Zimbabwe

This means that the United States has troops in 70 percent of the world’s countries. The average American could probably not locate half of these 135 countries on a map.

To this list could be added regions like the Indian Ocean territory of Diego Garcia, Gibraltar, and the Atlantic Ocean island of St. Helena, all still controlled by Great Britain, but not considered sovereign countries. Greenland is also home to U.S. troops, but is technically part of Denmark. Troops in two other regions, Kosovo and Hong Kong, might also be included here, but the DOD’s "Personnel Strengths" document includes U.S. troops in Kosovo under Serbia and U.S. troops in Hong Kong under China.

Possessions of the United States like Guam, Johnston Atoll, Puerto Rico, the Trust Territory of the Pacific Islands, and the Virgin Islands are likewise home to U.S. troops. Guam has over 3,200.