Merrimack County 7 13 16 13 12 61 Rockingham County 30 18 29 28 16 121 Strafford County 16 9 12 15 12 64 Sullivan County 5 4 3 4 3 19Compare RatesStart Now →Hillsborough County leads in total fatalities with 126. It is the home to the two most populous cities in Manchester and Na...