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Counties at Lake Pontchartrain, Louisiana
| County Name | Population |
Water Area Percentage |
Land Area Percentage |
| Jefferson Parish, LA | 455,466 | 52.29% | 47.71% |
| Orleans Parish, LA | 484,674 | 48.45% | 51.56% |
| St. Charles Parish, LA | 48,072 | 30.85% | 69.15% |
| St. John the Baptist Parish, LA | 43,044 | 37.07% | 62.93% |
| St. Tammany Parish, LA | 191,268 | 24.01% | 75.99% |
| Tangipahoa Parish, LA | 100,588 | 3.99% | 96.01% |
