Compared to the other cities in Illinois and cities in all other U.S. states, how safe is Sumner, IL? From the gauges displayed above, you will notice that Sumner, IL has been ranked safer than 90% of other cities in the state of Illinois. In addition, Sumner, IL is safer than 93% of cities in the entire United States. To achieve these results, all Illinois and United States cities were analyzed to determine how many locations had a lower crime rate than Sumner, IL. By studying this data, it was possible to determine that Sumner, IL is above average in safety when compared with other United States cities.