In this visualization by The Guardian, based on data from Amnesty International, we can see which countries still use the death penalty.

In 2012, 1,923 people were handed out a death sentence in 58 countries, and 976 executions were carried out in 20 countries.

China is by far the country that has carried out the largest number of executions, more than the rest of the world combined. Numbers are not know, though, since China keeps that information secret. China is followed by Iran, Iraq, Saudi Arabia, Kuwait, the United States, Yemen, Sudan, and Somalia.