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Counties at Portsmouth, New Hampshire
| County Name | Population |
Water Area Percentage |
Land Area Percentage |
| York County, ME | 186,742 | 22.06% | 77.94% |
| Rockingham County, NH | 277,359 | 12.47% | 87.53% |
| Strafford County, NH | 112,233 | 3.95% | 96.05% |
