Compared to the other cities in Maine and cities in all other U.S. states, how safe is Portland, ME? From the gauges displayed above, you will notice that Portland, ME has been ranked safer than 7% of other cities in the state of Maine. In addition, Portland, ME is safer than 31% of cities in the entire United States. To achieve these results, all Maine and United States cities were analyzed to determine how many locations had a lower crime rate than Portland, ME. By studying this data, it was possible to determine that Portland, ME is below average in safety when compared with other United States cities.