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Washington is the northwesternmost state of the contiguous United States, bordering Idaho, Oregon, and British Columbia. It has a diverse geography, with Western Washington having a Mediterranean climate and several volcanoes, and Eastern Washington having a dry climate and semiarid steppe.
SR 20, also known as the North Cascades Highway, is the longest state highway in Washington, crossing the Olympic Peninsula, Whidbey Island, and the Cascades. It connects several major north–south routes and scenic byways, and offers views of mountains, lakes, and rivers.
I-5 is a north–south Interstate Highway that spans 277 miles across Washington state, from the Oregon border to the Canadian border. It is the busiest and most congested highway in the state, with several auxiliary routes and scenic byways along its corridor.
SR 99 is a state highway in the Seattle metropolitan area, following former U.S. Route 99. It runs 49 miles (79 km) from Fife to Everett, passing through several cities and intersecting with other highways.
SR 520 is a state highway and freeway in the Seattle metropolitan area, connecting Seattle to the Eastside region of King County via the Evergreen Point Floating Bridge on Lake Washington. The freeway is 13 miles (21 km) long, has tolls, HOV lanes, and a shared-use trail, and serves several major intersections and landmarks.
Learn about the history, route, and features of US 97, a 322-mile (518 km) highway in Washington state. The highway connects major cities such as Yakima, Ellensburg, and Wenatchee, and crosses the Columbia River on the Sam Hill Memorial Bridge.
A comprehensive list of the 39 counties in the U.S. state of Washington, with their FIPS codes, county seats, formation dates, and namesakes. See a map of Washington's counties and their population densities.
SR 14 is a state highway in Washington that follows the north side of the Columbia River, opposite I-84 in Oregon. It forms part of the Lewis and Clark Trail Scenic Byway and connects Vancouver, Camas, Washougal, Stevenson, White Salmon, and Plymouth.