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 March 2018
Afghanistan, Bangladesh, Central African Republic, Democratic People's Republic of Korea (North Korea), Equatorial Guinea, Ghana, Haiti, Iran, Iraq, Lebanon, Liberia, Libya, Myanmar, Pakistan, South Sudan, Sudan, Syria, Timor-Leste, Turkey, and Uzbekistan.
For more information regarding PayPal and their services, please go to:
https://www.paypal.com/us/webapps/mpp/pay-online