Singapore has the highest execution rate in the world, at 13.65 hangings per 1,000,000 residents. Saudi Arabia has the second-highest rate, at 4.65 per 1,000,000. | Singapore has the highest execution rate in the world, at 13.65 hangings per 1,000,000 residents. Saudi Arabia has the second-highest rate, at 4.65 per 1,000,000. |