5. Rockford, Illinois
Violent crime rate: 1,659 per 100,000 residents
If you are surprised to see Rockford in the list of most lawless places in the US, then it is only natural. After all, Rockford may be the third largest city in the state of Illinois, but the population of Rockford is hardly over 150,000. Even in a city with such a small population, the rate of crime is staggering. It is the most crime-prone city in all of the United States, where the population is between 100,000 and 200,000. Thankfully, the law enforcement agencies are employing new operatives and new technologies to subdue the alarming crime rate in the city, and hopefully, when we get data for 2017, things will look much better for Rockford.