Manhattan Island Dimensions: 13.4 Miles Long, 1.2–2.3 Miles Wide

Manhattan Island (New York County) measures:

• Length: 13.4 miles (21.6 km) — Battery Park (south) to Inwood (north)
• Width: Variable
  • Narrowest: ~1.2 mi (1.9 km) — near 14th St / Chelsea
  • Widest: ~2.3 mi (3.7 km) — near 125th St / Harlem
• Area: 22.83 sq mi (59.1 km²)
• Shoreline: 32 mi (51.5 km) — Hudson (west), East River (east), Harlem River (north)

Context

Grid plan (Commissioners' Plan 1811): 12 avenues N-S, 155 streets E-W. 200-ft blocks (avg). 2.3M residents (2023) = 70,000/sq mi — densest US county.

Not Included

Marble Hill (mainland, legally Manhattan), Roosevelt Island, Randall's/Wards Islands, Governors Island, Liberty/Ellis Islands — all NYC but not Manhattan Island.