Hi,
The US Patent Office does not have any rules or restrictions about where the inventors live. They will take patent applications from any inventor in any country. However, your country where you live may have rules that say you have to first get permission or a license before you can file a patent application in another country. Here is a list of countries that have rules like this (note this list may not be complete so you may want to check with a patent attorney in your country):
Bulgaria
China
France (?may only apply to defense related inventions?)
Greece (Citizens of Greece)
India (Residents of India)
Italy
Malaysia (Residents of Malaysia)
New Zealand (Residents of New Zealand)
Poland
Portugal
Romania
Russia (Invention took place in Russia)
Singapore (Residents of Singapore)
Spain
United States (Invention took place in US)
Countries where Defense related applications need FFL
Belgium
Denmark
Finland
Luxenbourg
Netherlands
Republic of Germany
Sweden
United Kingdom
See this page:
http://www.wipo.int/pct/en/texts/nat_sec.html