Berkshire, Franklin, Hampshire and Hampden counties, in the year 2000 collectively had 814,967 residents, a population greater than that of any one of the six smallest U.S. states. The population amounted to approximately 12.84% of the 2000 population of the entire state of Massachusetts, which was 6,349,097. Its average population density is 293.07 inhabitants per square mile (113.16/km2), compared to 422.34/km2 (1,093.87/sq mi) for the rest of Massachusetts, and 312.68/km2 (809.83/sq mi) for the state as a whole.
