School District · Washington
Mercer Island School District
📍 Mercer Island, WA · King County · NCES LEAID 5304980
District Contact & InformationSource: NCES CCD 2024–25
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Grades Served
Pre-K – 12th
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District Mailing Address
4160 86TH AVE SE, MERCER ISLAND, WA 98040
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NCES District ID (LEAID)
5304980
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District Type
Public School District
Zip Codes Served by Mercer Island School District1 zip code
Frequently Asked Questions
What zip codes are in Mercer Island School District?▼
Mercer Island School District serves 1 zip code: 98040. Zip codes and district boundaries do not line up exactly, so confirm your exact address with the district office before you rely on an assignment.
How is Mercer Island School District rated?▼
Mercer Island School District has an overall rating of 10 out of 10 (Excellent), based on the share of students proficient in reading and math on state assessments (NCES EDFacts). That places it in the 100th percentile among Washington school districts. Ratings are percentile-ranked within Washington only and are not comparable across states.
How many students attend Mercer Island School District?▼
The NCES Common Core of Data directory reports enrollment of 4,057 students across 6 schools for Mercer Island School District.
What grades does Mercer Island School District serve?▼
Mercer Island School District is listed in the NCES directory as serving grades Pre-K – 12th.
How do I contact Mercer Island School District?▼
You can reach Mercer Island School District by phone at (206)236-3300 or by mail at 4160 86TH AVE SE, MERCER ISLAND, WA 98040. Contact details come from the NCES district directory and are the best way to confirm which school your address is assigned to.
About Mercer Island School District
Mercer Island School District is a public school district serving 1 zip code in Washington, primarily in King County. It carries an overall rating of 10/10 (Excellent), the 100th percentile among Washington districts. That rating reflects the share of students proficient in reading and math on state assessments (NCES EDFacts, 2021–22 for most districts with a 2017–18 fallback for the rest) and is ranked only against other Washington districts — scores are not comparable between states. Directory details on this page come from the NCES Common Core of Data, 2024–25.
District boundaries are address-specific and do not follow zip code lines exactly — a single zip code can
be split between two or more districts. Use the zip codes listed above as a starting point, then confirm your
assignment with the district office at (206)236-3300 before making a housing decision.