Compared to the other cities in Kansas and cities in all other U.S. states, how safe is Colby, KS? From the gauges displayed above, you will notice that Colby, KS has been ranked safer than 13% of other cities in the state of Kansas. In addition, Colby, KS is safer than 20% of cities in the entire United States. To achieve these results, all Kansas and United States cities were analyzed to determine how many locations had a lower crime rate than Colby, KS. By studying this data, it was possible to determine that Colby, KS is below average in safety when compared with other United States cities.