Kennewick is a city in Benton County in the southeastern part of the State of Washington, along the southwest bank of the Columbia River, just southeast of the confluence of the Columbia and Yakima rivers and across from the confluence of the Columbia and the Snake River. It is the most populous of the three cities collectively referred to as the Tri-Cities. The population was 73,917 at the 2010 census. April 1, 2013 estimates from the Washington State Office of Financial Management put the city's population at 76,410.The nearest commercial airport is the Tri-Cities Airport in Pasco, a regional commercial and private airport.