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Grand Isle
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| County Name | Population |
Water Area Percentage |
Land Area Percentage |
| Jefferson Parish, LA | 455,466 | 52.29% | 47.71% |
| Lafourche Parish, LA | 89,974 | 26.32% | 73.68% |
| Plaquemines Parish, LA | 26,757 | 65.22% | 34.78% |
