List of counties in the Susquehanna River watershed

The Susquehanna River is in the U.S. States of Maryland, Pennsylvania and New York. As of 2000, the Susquehanna drainage basin population was 3,968,635. Its total area is 27,486 square miles (71,188 km²), and in 2000 612 square miles (1,585 km²) were developed, 8,041 square miles (20,826 km²) were used for agriculture, 18,181 square miles (47,089 km²) were forested, 27,486 square miles (71,188 km²) were open water, 127 square miles (329 km²) were wetland, and 201 square miles (521 km²) were barren. By area, the Susquehanna basin accounts for 45% of Pennsylvania, 11% of New York, and 3% of Maryland . The drainage basin is divided into six subbasins by the Susquehanna River Basin Commission. These are:

• Lower Susquehanna (green on the map at right)
• Juniata River (pink)
• West Branch Susquehanna River (orange)
• Middle Susquehanna (purple)
• Chemung River (Yellow)
• Upper Susqehanna River (brown)