This is a good question – Perhaps yes, but probably no. The name "Puget Sound" (earlier "Puget's Sound") was given by George Vancouver for Lieutenant Peter Puget, who explored its southern end in May 1792. Vancouver claimed it for Great Britain on 4 June 1792. It became part of the Oregon Country, and became a USA territory when the 1846 Oregon Treaty was signed.
Originally, the name Puget Sound referred only to the southern reaches beyond Poverty Bay explored by Peter Puget, and the central and northern reaches familiar to Washington State Ferry riders was called Admiralty Inlet. Today Admiralty Inlet refers only to the strait between Whidbey Island and Point No Point on the Kitsap Peninsula. But on a modern nautical chart, Admiralty Inlet is a distinct body of water from the Puget Sound. The northern border of the Puget Sound on the East is formed by Possession Sound, which separates Whidbey Island from Everett.
Based on this commonly accepted definition Fidalgo Island is clearly not part of Puget Sound – So like any good navigator you are probably asking, where are we?
Perhaps the best and most technically accurate explanation is that we are part of the Salish Sea. The Salish Sea or Whulge are neologistic names coined in recent years for the great inland waterway stretching from Tumwater, Washington to before the Johnstone Strait, British Columbia that was the central resource of the First Nations Coast Salish peoples who historically and presently inhabit the area.
So now you know – For more information click here.