Compared to the other cities in California and cities in all other U.S. states, how safe is Hillsborough, CA? From the gauges displayed above, you will notice that Hillsborough, CA has been ranked safer than 99% of other cities in the state of California. In addition, Hillsborough, CA is safer than 88% of cities in the entire United States. To achieve these results, all California and United States cities were analyzed to determine how many locations had a lower crime rate than Hillsborough, CA. By studying this data, it was possible to determine that Hillsborough, CA is above average in safety when compared with other United States cities.