How many countries does the US allow to have dual citizenship with and which countries are they?

US Law does not restrict its citizens from having multiple citizenships!

Countries Which Allow Dual Citizenship: Bangladesh, Brazil, Canada, Colombia, Cyprus, Egypt, El Salvador, Federal Republic of Yugoslavia, France, Greece, Hungary, Ireland, Israel1, Italy, Jamaica, Jordan, Latvia, Lebanon, Lithuania, Macedonia, Malta, Mexico, New Zealand, Pakistan*, Portugal, Serbia and Montenegro, South Africa*, Spain (only in certain cases), Sweden, Switzerland, Syria, Tonga (only in certain cases), Turkey, United Kingdom, United States of America, Western Samoa.

• Persons retain their former citizenship if they apply to retain it before taking out Australian citizenship.
• Iran allows its citizens to hold more than one citizenship. However, it tends recognizes its citizens solely as Iranians.
• Note that Germany has recently amended its citizenship laws so that in some exceptional circumstances, dual citizenship is now allowed. Consult the German Foreign Office website for details.
• Also, India announced on 8 January 2002 that it will shortly change its law to allow dual citizenship for Indians settled outside India.

1 In case of Israel, dual citizenship is only allowed for those who immigrate to Israel based on Law of Return (i.e. Jewish people).