Lakes / Louisiana / Jefferson County / Lake Pontchartrain
Lake Pontchartrain, Louisiana
407,803.25 acres
Surface Area
Where It Sits, and How Deep It Goes
Locator - Louisiana
30.18 degrees N, 90.13 degrees W - Jefferson County. State and county outlines drawn from Census boundary data; the lake marker is placed by its Louisiana Department of Wildlife and Fisheries coordinates, not by eye. Schematic - not a survey map.
How Lake Pontchartrain Stacks Up
- The largest lake counted in Louisiana by surface area - 407,803.25 acres.
- The largest lake in Jefferson County among those counted.
- About 16 miles from New Orleans, as the crow flies.
Lakes Nearby
| Lake | County | Distance | Surface Area |
|---|---|---|---|
| Bayou Des Mats | St. Tammany | 12 mi | 1,614.46 acres |
| Lake Marseille | Orleans | 15 mi | 70.42 acres |
| Lake Michoud | Orleans | 15 mi | 70.72 acres |
| Lake Antoinne | Orleans | 15 mi | 71.47 acres |
| Lake Maisson | Orleans | 15 mi | 62.03 acres |
| Blind Lagoon | Orleans | 16 mi | 1,357.1 acres |
Straight-line distance between lake centers.
Facts and Figures
Questions About Lake Pontchartrain
How Big Is Lake Pontchartrain?
Lake Pontchartrain covers 407,803.25 acres in Jefferson County, Louisiana.
What Is the Largest Lake in Jefferson County?
Lake Pontchartrain is the largest lake in Jefferson County, at 407,803.25 acres.
Deepest Natural Lakes in Louisiana
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | False River | Pointe Coupee | 3,212 acres | 65 ft |
| 2 | Vernon Lake | Vernon | 6 acres | 53 ft |
| 3 | Lake Concordia | Concordia | 1,026 acres | 50 ft |
| 4 | Caney Creek Reservoir | Jackson | 4,738 acres | 43 ft |
| 5 | Lake Providence | East Carroll | 1,380 acres | 37 ft |
All 27 Louisiana lakes ranked by depth
Largest Lakes in Louisiana
| # | Lake | County | Surface Area | Max Depth |
|---|---|---|---|---|
| 1 | Lake Pontchartrain | Jefferson | 407,803.25 acres | - |
| 2 | Toledo Bend Reservoir | Sabine | 181,600 acres | 110 ft |
| 3 | Lake Maurepas | Livingston | 58,308.4 acres | - |
| 4 | Sabine Lake | Cameron | 56,867.74 acres | - |
| 5 | White Lake | Vermilion | 55,913.91 acres | - |
All 664 Louisiana lakes ranked by surface area
Sources: USGS National Hydrography Dataset (The National Map) lake data (ID {e4a547e7-d538-4cdc-bd2b-38a0fb2728c7}). Verified October 30, 2026.