BPHC Criterion County
Mapped in 2010, this map illustrates U.S. frontier counties based on the BPHC criterion, highlighting regions with population densities of 7 people or fewer per square mile in 48 states.
Driving Impact for Frontier Equity
Mapped in 2010, this map illustrates U.S. frontier counties based on the BPHC criterion, highlighting regions with population densities of 7 people or fewer per square mile in 48 states.