what county is chehalis washington in
Chehalis, WA. Sponsored Topics. Chehalis (i/ÊÉheÉªlÉ¨s/ US dict: shÉÂ·hÄâ²Â·lÄ­s) is a city in Lewis County, Washington, United States. The population was 7,259 at the 2010 census. It is the county seat of Lewis County.