- Renton is a city in King County, Washington, United States. It is located about 11 miles southeast of downtown Seattle and is situated on the southeastern shore of Lake Washington. Renton is known for its diverse population, thriving business community, and beautiful natural scenery. The city offers a variety of recreational activities, including hiking, biking, and boating, thanks to its proximity to Lake Washington and the Cedar River. Renton is also home to several major companies, including Boeing Commercial Airplanes, the largest private employer in the city.