With 479 murders in 1991, Washington, D.C. was referred to as the murder capital of America. Despite its rough past, the city has greatly improved, recording only 103 murders in 2013. Robberies have been increasing due to rising incomes in the area but crime is still quite concentrated: 5% of the city recorded 25% of its crime.
Source: FBI 2013 UCR & D.C. Crime Policy Institute, Image: Wikimedia