access to KCLS collections under reciprocal borrowing agreements between KCLS and Seattle's libraries. KCLS also extends reciprocal borrowing privileges to residents of many other library systems in Western and North Central Washington. KCLS annexed Renton's public library system in 2010 following a vote by the city's residents.

In 2011, KCLS won the Gale/Library Journal "Library of the Year" award. The library eliminated its late fines in 2023 after finding