Compared to the other cities in Ohio and cities in all other U.S. states, how safe is Ada, OH? From the gauges displayed above, you will notice that Ada, OH has been ranked safer than 94% of other cities in the state of Ohio. In addition, Ada, OH is safer than 91% of cities in the entire United States. To achieve these results, all Ohio and United States cities were analyzed to determine how many locations had a lower crime rate than Ada, OH. By studying this data, it was possible to determine that Ada, OH is above average in safety when compared with other United States cities.