The rankings were based on evaluations from 215 cities with populations of more than 100,000 residents and included analysis of the city’s violent and property crime data, including murder, assault, robbery, burglary, larceny and vehicle theft rates.
Niche, a Pittsburgh-based ranking and review web site, used the 2013 FBI Uniform Crime Report “Crime in the United States,” an annual publication that reports the number and rate of violent and property crime offenses. They then used a formula to determine the city’s safety ranking, which includes weighting the crime by category: murder rate at 30 percent; assault and robbery at 20 percent each; and burglary and larceny at 10 percent each.
Two Naperville officials are quoted in the story praising crime prevention efforts. This helps but my guess regarding the bigger factor is the wealth of the community. According to the latest (2013) Census estimates: Naperville has a median household income of $108,302, the poverty rate is 4.1%, and the percent of residents with a high school degree is 96.5% and 65.9% have a bachelor’s degree. There are plenty of wealthy communities in the United States but they tend to be smaller. Once you get cities bigger than 100,000, it is hard to find many that have the number of educated and wealthy residents as Naperville.