| County | Rank | Change (2020) ↓ | 2026 Pop. | 2020 Pop. |
|---|---|---|---|---|
| Carroll County | 1 | 5.47% | 53,002 | 50,251 |
| Rockingham County | 2 | 3.66% | 326,153 | 314,633 |
| Strafford County | 3 | 3.56% | 135,755 | 131,084 |
| Hillsborough County | 4 | 3.19% | 436,388 | 422,902 |
| Merrimack County | 5 | 2.95% | 158,609 | 154,061 |
| Grafton County | 6 | 2.48% | 93,457 | 91,193 |
| Cheshire County | 7 | 2.39% | 78,370 | 76,541 |
| Sullivan County | 8 | 2.15% | 43,998 | 43,073 |
| Belknap County | 9 | 2.11% | 65,125 | 63,779 |
| Coos County | 10 | 0.24% | 31,309 | 31,235 |
New Hampshire's counties show varied growth patterns from 2020 to 2026. Carroll County leads with 0.89% annualized growth, followed by Rockingham County (0.6%) and Strafford County (0.59%). The largest counties are Hillsborough County (436,388), Rockingham County (326,153), and Merrimack County (158,609). All 10 counties in New Hampshire are growing. Overall, counties averaged 0.46% annualized growth, with total population growing by 0.52% annually.
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