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A small number of crimes in places with very small populations produce statistics that aren't representative of actual conditions.

A single incident of triple homicide in a town of 100 people would show up in the stats as 3,000 homicides per 100,000 people when extrapolated out to level the population to the standard.

That's one of the reasons that the FBI cautions not to use its UCR reports for direct city to city comparison purposes, and is most likely why so many smaller towns are showing up in the list in this post while Dallas does not.