Hydrological Unit: Patuxent
| HUC | Name |
|---|---|
| 0206000601 | Headwaters Patuxent River |
| 0206000602 | Little Patuxent River |
| 0206000603 | Western Branch Patuxent River |
| 0206000604 | Upper Patuxent River |
| 0206000605 | Middle Patuxent River |
| 0206000606 | Lower Patuxent River |
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