As noted in Alaskan Way, Harbor Avenue SW was once part of Railroad Avenue. When the Elliott Bay tidelands were platted in 1895, Railroad Avenue stretched from (using current landmarks) the Magnolia Bridge along the waterfront to the Industrial District, then across Harbor Island to West Seattle, ending southwest of Duwamish Head. In 1907 the West Seattle portion was renamed Alki Avenue, and sometime between 1912 and 1920 it was given its current name.

Looking northwest up what is now Harbor Avenue SW toward Duwamish Head, April 1902
Looking northwest up what is now Harbor Avenue SW toward Duwamish Head, April 1902

Today, Harbor Avenue SW begins at SW Avalon Way and SW Spokane Street at the west end of the West Seattle Bridge and goes 1¾ miles northwest to Duwamish Head, where it becomes Alki Avenue SW.

Street sign at corner of Harbor Avenue SW and Alki Avenue SW, October 2017
Street sign at corner of Harbor Avenue SW and Alki Avenue SW, Duwamish Head, with Elliott Bay and downtown Seattle in background, October 2017. Photograph by Ron Clausen, Wikimedia Commons, licensed under Creative Commons Attribution-ShareAlike 4.0 International

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