4. Tri-Cities, Washington - Wikipedia
Description: 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—a suburb of Richland, as well as the fourth largest city in the metropolitan area—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.