Population of Counties in New Hampshire (2018)

Name 2018 Population Growth Since 2010
Hillsborough County409,6972.16%
Rockingham County306,3633.75%
Merrimack County149,2161.94%
Strafford County128,6134.41%
Grafton County89,3860.31%
Cheshire County75,960-1.41%
Belknap County60,7851.15%
Carroll County48,0640.48%
Sullivan County43,077-1.57%
Coos County31,634-4.06%