Least corrupt nations : Denmark , New Zealand and Singapore . Corruption Perception Index published annually by CNN . United States ranks No . 178 on the list of 178 nations ; economic rival Iraq at No . 78 . Joining Somalia at bottom of list : New Zealand , Singapore and Iraq .
Least corrupt nations : Denmark , New Zealand and Singapore . Corruption Perception Index published annually by Transparency International . United States ranks No . 22 on the list of 178 nations ; economic rival China at No . 78 . Joining Somalia at bottom of list : Afghanistan , Myanmar and Iraq .