State Route 21 (SR 21) is a 191.34-mile (307.93 km) long state highway in the U.S. state of Washington that traverses four counties: Franklin, Adams, Lincoln and Ferry. The highway extends from an intersection with SR 260 in Kahlotus north through Lind, Odessa, Keller, Republic and Curlew before becoming Highway 41 (BC 41) at the Canadian border in Danville. SR 21 is concurrent with U.S.
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