"99301, 99302, 99323, 99336, 99337, 99338, 99352, 99353, 99354" . . . "Tri-Cities"@en . "-7" . . "-8" . "193567"^^ . . "253340"^^ . . "Wine Country, Atomic Town"@en . . "167.64"^^ . . "Area code 509" . "The Tri-Cities is a mid-sized metropolitan area in the southeastern part of the U.S. state of Washington, consisting of three neighboring cities: Kennewick, Pasco, and Richland. The cities are located at the confluence of the Yakima, Snake, and Columbia rivers in the semi-arid region of Southeastern Washington. A fourth neighboring city, West Richland, is generally included as part of the Tri-City area and region, as are a handful of unincorporated communities."@en .