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King County Library System

King County Library System Market Share Analysis for April 2026

The King County Library System is a library system serving most residents of King County, Washington, United States. Headquartered in Issaquah, Washington, KCLS was the busiest library system in the United States as of 2010, circulating 22.4 million items.

Science and Education > Libraries and Museums

Domainkcls.org

Year Founded1942

Employees1001 - 5000

Annual Revenue$100M - $200M

King County Library System

King County Library System (including company regionals)

kcls.org

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King County Library System Revenue up to April 2026 is 100M - 200M

revenue generated by King County Library System top domains

King County Library System top domains revenue over 3 years

Revenue for King County Library System top domains

kcls.org100M - 200M

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Total visits to King County Library System's top domains

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Total visits last 3 months

Subsidiaries Breakdown

kcls.org533.3K

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Avg. visit duration in King County Library System's top domains

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Average visit duration last 3 months

Subsidiaries Breakdown

kcls.org00:01:34

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Avg. pageviews on King County Library System's top domains

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Average page views last 3 months

Subsidiaries Breakdown

kcls.org2.34

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King County Library System top competitors by domain

Top similar sites in April 2026, ranked by their affinity

spl.orgCompany NameSeattle Public LibraryEmployees501 - 1000HQUnited States, Washington, SeattleAnnual revenue$100M - $200MTotal visits474.3KScience and Education > Libraries and Museums

Top technologies used by King County Library System

These are the website technologies, by industry, used by King County Library System top domains

Conversion & Analytics (8)

Google Analytics

Payment & Currencies (8)

PayPal

Social (6)

Instagram

Advertising (5)

DoubleClick

More Technologies

14

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News & Signals from King County Library System

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NewsKing County Library System partners with White Center Food Bank.The White Center Library will also partner with the White Center Food Bank for a special cookbook launch accompanied by various art activities.

NewsKing County Library System receives award LEED Platinum certification.Redmond Library has formally received LEED Platinum certification - the highest level of sustainable building certification.

NewsVashonfoodbank partnered with King County Library System on Mar 18th '26.Vashon Food Bank currently partners with island organizations like the Vashon Library, Granny's Attic, and Vashon Island Pet Protectors, offering free pet food, books, clothing, and other resources.