Alaska is the U.S. state with the longest coastline by a huge margin, with roughly 33,900–34,000 miles of shoreline depending on the measurement method.

Quick scoop

  • The state with the longest coastline: Alaska.
  • Approximate shoreline length: 33,904 miles of ocean and tidal shoreline, more than all other U.S. states combined.
  • Next longest: Florida (~8,436 miles) and Louisiana (~7,721 miles), both still far behind Alaska.

Why Alaska dominates

  • Alaska’s jagged, highly indented shores, plus thousands of islands and bays, add up an enormous amount of shoreline.
  • Its coasts touch both the Pacific Ocean and the Arctic Ocean , further increasing total coastal extent.

A quick note on “coastline”

  • Length can vary depending on whether you count only general ocean edge or every inlet, bay, and tidal area, but Alaska remains the clear #1 under standard NOAA-style shoreline calculations.

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Wondering which state has the longest coastline? Alaska tops the list with about 33,904 miles of shoreline, far exceeding Florida and Louisiana, according to recent coastal length data.

Information gathered from public forums or data available on the internet and portrayed here.