Washington County Cooperative Library Services (WCCLS) is the library system serving Washington County, Oregon.

WCCLS distributes tax funds to libraries.

[2] WCCLS is made up of 16 libraries which are operated by 13 cities and non-profit organizations.

[3] Libraries that were formerly affiliated with WCCLS included ones in the former Tanasbourne Mall (before the Tanasbourne area was incorporated) and, in the 1970s, Aloha Park Library, located in Aloha Park school, which was open to the public one night a week.

[6] Additionally, the Tuality Health Resource Center closed in August.