Compared to the other cities in Idaho and cities in all other U.S. states, how safe is Post Falls, ID? From the gauges displayed above, you will notice that Post Falls, ID has been ranked safer than 40% of other cities in the state of Idaho. In addition, Post Falls, ID is safer than 43% of cities in the entire United States. To achieve these results, all Idaho and United States cities were analyzed to determine how many locations had a lower crime rate than Post Falls, ID. By studying this data, it was possible to determine that Post Falls, ID is below average in safety when compared with other United States cities.