SR 920 was added to the state highway system in 1975. The route started at Jct SR 901/West Lake Sammamish Parkway and headed east to Jct SR 202 east of Downtown Redmond. This route had already been designated as part of SR 520. When SR 920 opened to traffic it was posted as SR 920. When the missing gap in SR 520 from 148th Ave NE to West Lake Sammamish Parkway opened to traffic circa 1979, SR 920 was reposted as SR 520.
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