| County | County Origins | Area in square miles | Host |
| Belknap | 1840, for Jeremy Belknap (1744-98), Portsmouth minister & early NH historian | 401.3 | ADOPTABLE |
| Carroll | 1840, for Charles Carroll of Carrollton (1737-1832), signer of the Declaration of Independence | 933.9 | ADOPTABLE |
| Cheshire | 1769, for Cheshire, England | 707.5 | ADOPTABLE |
| Coos | 1803, Indian word meaning "crooked", for a bend in the Connecticut River | 1,800.6 | ADOPTABLE |
| Grafton | 1769, for Augustus Henry Fitzroy (1735-1811), the third Duke of Grafton (England) | 1,713.5 | ADOPTABLE |
| Hillsborough | 1769, for Wills Hill (1718-1793), Earl of Hillsborough (Ireland/Great Britain) | 876.5 |
ADOPTED |
| Merrimack | 1823, after the Merrimack River | 934.5 | ADOPTABLE |
| Rockingham | 1769 for Charles Watson Wentworth (1730-82), the second Marquis of Rockingham (England) | 695.2 | ADOPTABLE |
| Stafford | 1769, for William Wentworth, the Earl of Strafford (England), ancestor of NH Governors Benning and John Wentworth | 368.8 | ADOPTABLE |
| Sullivan | 1827, for John Sullivan (1740-1795), Governor of NH | 537.4 | ADOPTABLE |
Contact
Linda Simpson for more information.