I am not certain that population density reaches its nadir in the Rockies. In those states (Utah and Colorado in particular), the population is clustered in t

I am not certain that population density reaches its nadir in the Rockies. In those states (Utah and Colorado in particular), the population is clustered in towns and cities along the Wasatch and Rocky Mountain ranges. In the midwest there is a more rural distribution. It would be interesting to look at suicide rates by population density at level lower than state or county.