Seattle Public Schools enrollment is down 8% from its 2019–20 peak
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Enrollment peaked at 53,627 in 2019–20, fell ~4,400 over two years, and has roughly leveled off.

Enrollment peaked at 53,627 students in 2019–20, then fell sharply over the next two years. By 2024–25 the district counted 49,240 — down about 4,400 students, or 8%. It has roughly leveled off since 2022–23.
Source: Seattle Public Schools, Annual Enrollment Reports (October headcount). Annual; the 2025–26 count is expected in the next report, typically released the following spring/summer.