About Tri-Cities Washington State

The Tri-Cities is an area of the state of Washington that is made up of three neighboring cities: Kennewick, Pasco, and Richland, and is ranked as the 191st most populous metropolitan area of the U.S. The cities are located at the confluence of the Yakima, Snake, and Columbia rivers in the desert region of Southeastern Washington. A fourth neighboring city, West Richland, is generally included as part of the Tri-City area and region. Official April 1, 2006 population estimates from the state are as follows: Kennewick: 60,997 || Pasco: 46,494 || Richland: 44,317 || West Richland: 9,907 || Total: 161,715

Tri Cities Washington ~ Founding
Pasco was the first of the Tri-Cities to be incorporated, in 1891. Kennewick was incorporated in 1904, and Richland followed in 1910. West Richland was founded by dissatisfied residents of Richland, who wished to be home owners rather than renters of government owned houses, after the arrival of Hanford. Despite attempts by Richland to annex the community, they remained separate and eventually became incorporated in 1955.  See Wikipedia, Tri-Cities Washington.