Here's a link to all the countries that PayPal services:
https://www.paypal.com/webapps/mpp/country-worldwide
Here is a list of countries that are unable to use PayPal services:
As of May 2013
Afghanistan, Bangladesh, Cameroon, Central African Republic, Cote D'Ivoire (Ivory Coast), Democratic People's Republic of Korea (North Korea), Equatorial Guinea, Gabon, Ghana, Haiti, Iran, Iraq, Lebanon, Liberia, Libya, Monaco, Moldova, Montenegro, Myanmar, Pakistan, Paraguay, Saint Lucia, South Sudan, Sudan, Syria, Timor-Leste, Uzbekistan and Zimbabwe.
For more information regarding PayPal and their services, please go to:
https://www.paypal.com/us/webapps/mpp/pay-online