The population count of Norfolk County, MA was 662,077 in 2010. The population count of Plymouth County, MA was 490,784 in 2010. The population count of Hillsborough County, NH was 399,555 in 2010. The population count of Rockingham County, NH was 294,638 in 2010.
Population
Population Change
Above charts are based on data from the U.S. Census American Community Survey | ODN Dataset | API -