Summary:
ZIP code 06830 is served by a single high school, Greenwich High School, which enrolls 2,620 students in grades 9–12 as part of the Greenwich School District. As the only high school in the area, all attention falls on this one institution—and it delivers. The district is ranked 14th out of 153 districts in Connecticut, placing it in the 91st percentile with a 5-star rating, and the high school sits comfortably in the top tier of schools statewide.
The school's academic metrics are exceptionally strong. The graduation rate is 98.0 percent, compared with the state average of 91.2 percent. On the 11th-grade NGSS science exam, Greenwich High School reached 87.8 percent proficiency in 2025–2026, dramatically exceeding the state average of 50.5 percent. Chronic absenteeism is just 7.9 percent, less than half the state rate of 16.4 percent. The student-teacher ratio is a favorable 13.3 to 1, and per-student spending is $15,406. About 22.8 percent of students qualify for free or reduced lunch, reflecting moderate socioeconomic diversity within the community.
Greenwich High School has a consistent track record of excellence. Its ranking improved from 16th out of 121 schools in 2017–2018 to 12th out of 200 schools in 2020–2021, climbing from the 87th to the 94th percentile. The school's metrics closely mirror the district's, showing that this high school is the primary driver of the district's strong reputation. For parents, the combination of strong funding, a low student-teacher ratio, near-universal graduation, and outstanding science proficiency makes Greenwich High School a model learning environment that outperforms state averages by significant margins.
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