Compared to the other cities in Iowa and cities in all other U.S. states, how safe is North Liberty, IA? From the gauges displayed above, you will notice that North Liberty, IA has been ranked safer than 49% of other cities in the state of Iowa. In addition, North Liberty, IA is safer than 49% of cities in the entire United States. To achieve these results, all Iowa and United States cities were analyzed to determine how many locations had a lower crime rate than North Liberty, IA. By studying this data, it was possible to determine that North Liberty, IA is below average in safety when compared with other United States cities.