Lakeridge Elementary School

Located at 8215 SE 78th, in Mercer Island, Washington, Lakeridge Elementary School is a mid-sized elementary campus that hosts 401 students (grades K through 5), operated by Mercer Island School District.

Across the 6 schools in Mercer Island School District (3,993 students total), Lakeridge Elementary School accounts for its share of the district's footprint.

Looking at the student body, Lakeridge Elementary School logs that 44% of students identify as White, with the remaining enrollment distributed across several groups. The remainder consists of 29% Asian, 21% multiracial, 5% Hispanic. That is visibly less White than the county at large, where the share is closer to 55%.

On the income-and-resources front, On paper, Lakeridge Elementary School has 23 full-time-equivalent teachers, translating to a class-load average of around 17.2:1. The state averages about 17.3:1, putting this campus right in line with peers. About 3% of enrolled students meet the income threshold for free or reduced-price lunch, a commonly cited indicator of low-income enrollment. That share is noticeably below King County's rate of about 38%.

On a residual basis (actual vs predicted given the student mix), Lakeridge Elementary School tracks the demographic baseline. The model predicts 77.9% given the school's FRL share; actual proficiency is 87.3%.

In the surrounding community, ACS estimates for King County put median household income runs about $124,746, roughly 57% of adults have completed at least a four-year degree, and roughly 5% of residents live below the federal poverty line. In all, King County runs 544 public schools (combined enrollment of about 278,492 students), of which Lakeridge Elementary School is one.

The closest other public school is Islander Middle School, roughly 0.4 miles away. Within five miles, there are 8 other public schools. Ranking that nearby cluster on reported proficiency puts Lakeridge Elementary School at 2nd of 8; the average score across the group is 50.5%.

The campus sits in a residential setting.

Trend over the last 7 years. Over the past 7-year window, the student count shrank 15%: 471 students in 2018 compared to 401 in 2025. White enrollment moved from 63% to 44% across the same window. The student-to-teacher ratio fell from 18.4:1 in 2018 to 17.2:1 today.

On this page, members of the Lakeridge Elementary School community share and discuss classroom updates, athletics, and weather closures. Members of the school community can share what they know.