- Marginal Place SW – January 27, 2022
- W Pleasant Place – January 27, 2022
- Birch Avenue N – January 25, 2022
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.

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.

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