Most Dangerous City in the US Is... ...St. Louis, with 2,070 violent crimes per 100K residents 33 comments Comments The depressed section of Interstate 70 passes in front of the Gateway Arch and the grounds of the Jefferson National Expansion Memorial in St. Louis. (AP) (User Submitted) – St. Louis was named the most dangerous city in the United States, edging out last year's top-ranked city, Camden, NJ, according to a new study released today. The crime rates were calculated using FBI statistics in six categories: murder, rape, robbery, aggravated assault, burglary, and motor vehicle theft. According to the study, published by CQ Press, St. Louis experienced 2,070.1 violent crimes per 100,000 residents in 2009. Rounding out the top five were Detroit and Flint, Mich., and Oakland, Calif. Click here to see the full results.