Compared to the other cities in New Jersey and cities in all other U.S. states, how safe is Roselle, NJ? From the gauges displayed above, you will notice that Roselle, NJ has been ranked safer than 39% of other cities in the state of New Jersey. In addition, Roselle, NJ is safer than 64% of cities in the entire United States. To achieve these results, all New Jersey and United States cities were analyzed to determine how many locations had a lower crime rate than Roselle, NJ. By studying this data, it was possible to determine that Roselle, NJ is above average in safety when compared with other United States cities.