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Washington Interstates

11 Supported Divided Highways

182
I-18220 miles
Richland to Pasco
205
I-20510 miles
Vancouver, WA
405
I-40531 miles
Seattle to Lynnwood
5
I-5275 miles
Portland to Blaine
705
I-7051 miles
Tacoma, WA
82
I-82122 miles
Ellensburg to Umatilla
90
I-90296 miles
Seattle to Post Falls
167
WA 16720 miles
Puyallup to Renton
18
WA 1818 miles
Auburn to Maple Valley
512
WA 51211 miles
Lakewood to Puyallup
520
WA 52013 miles
Seattle to Redmond