The population count of Norfolk County, MA was 694,389 in 2017. The population count of Plymouth County, MA was 509,114 in 2017. The population count of Hillsborough County, NH was 406,371 in 2017. The population count of Rockingham County, NH was 302,479 in 2017.
Population
Population Change
Above charts are based on data from the U.S. Census American Community Survey | ODN Dataset | API -