Kennewick, Washington Kennewick is located within Benton County in south-eastern Washington. It is one of the three major cities to make up the Tri-Cities area along with Pasco and Richland. It has a population of 51,696 residents and covers over 52 square kilometers of land.
Kennewick is the Indian name for "Winter Heaven" give to this site because of its mild winters. The area has a growth season of 185 days and 300 days of sunshine per year.
