washington tri cities population
Tri-City Regional Facts. The Tri-Cities MSA is the 4th Largest Metropolitan Statistical Area in the state of Washington. The Tri-Cities is located in southeast Washington and is situated at the confluence of the Columbia, Snake and Yakima Rivers. With a population of 248,400, the major communities are Kennewick, Pasco, Richland and West Richland. Climate. The Tri-City region enjoys approximately 300 days of sunshine per year.