Richland is a city in Benton County in southeastern Washington, USA, at the confluence of the Yakima River and the Columbia River. As of the 2000 census, the city population was 38,708, with a 2005 population estimate of 43,520. Along with the nearby cities of Pasco and Kennewick, Richland is one of the Tri-Cities of Washington. Richland apartments for rent comparison page shows most up to date rent information on Richland apartments and houses. Rent information is obtained from multiple rental sources but we cannot guarantee their accuracy.