Great Schools.org provides listings nationwide on school performance, including parent ratings and reviews. 

SchoolDigger.com is a school comparison site that provides test score data, demographic data, and neighborhood information.

State Report Card at the Office of Superintendent of Public Instruction provides current and historical test scores by school and district. It also provides other detailed information by school. To drill down for the data, use the search box on the top right-hand side of the OSPI site.

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Seattle School District

Mercer Island School District

Bellevue School District

Redmond School District

Northshore School District

Lake Washington School District

Issaquah School District

Snoqualmie Valley School District

Edmonds Schools District

Mukilteo School District

Lake Stevens School District

Shoreline School District

Lynwood School District

Renton School District

Tahoma School District

Highline School District

Des Moines School District

Kent School District

Federal Way School District

Tacoma School District

University Place School District

Everett School District

Monroe School District

Snohomish School District