Discover the
history of
Lewis County

"The Mother
of All Counties"

The Lewis County Historical Society and Museum celebrates the storied history of Lewis County, Washington. Founded on December 21, 1845, Lewis County once stretched at one point from the Cowlitz River to the south and north to Sitka, Alaska. Come celebrate our rural heritage of the hop fields and timber industry to the Chehalis and Cowlitz Native American tribes.

Lewis County Historical Society Membership

Become a member of the Lewis County Historical Museum family with a museum membership! Your membership to the Historical Society family helps support historical preservation, education, and digitization programs throughout the Museum.

Join today!


Come on down to historic downtown Chehalis for ChehalisFest! Kicking off with a blueberry pancake breakfast at the Historical Museum and different events throughout town all day! Spend the day in Chehalis with a beer festival, car show, entertainment, and sidewalk sales!

For more information >>

Lewis County
Historical Society
Research Library

The research library holds countless archives and records chronicling the entire history of Lewis County.

Search records online here >>