Admitted to the Union on June 21, 1788 as the 9th state.

• 1790, 1810, 1830 – 1940 federal censuses extant for all counties except for 1890.
• 1800 federal census extant for all counties except parts of Rockingham and Strafford.
• 1820 federal census extant for all counties except all of Grafton, parts of Rockingham and Strafford.