Summary:
Zip code 06870 is home to just one elementary school, Old Greenwich School, which serves grades PK–5 and enrolls 385 students within the highly rated Greenwich School District.
Old Greenwich School is a clear standout performer, earning a 5-star rating from SchoolDigger and ranking #12 out of 491 Connecticut elementary schools (98th percentile) for 2025–2026, after an even stronger #4 ranking the previous year. Academic proficiency is exceptionally high, with 2025–2026 average 3rd–5th grade proficiency at 84.1% in ELA and 85.8% in math, compared to state averages of just 50.6% and 50.0%, respectively—roughly 34 to 36 percentage points ahead of the rest of Connecticut. The school also outperforms its already strong district in most subjects. A very affluent student body, reflected in a 2.34% free/reduced-price lunch rate, combined with a low 10.5:1 student-teacher ratio and high per-student spending of approximately $33,050, underscores a well-resourced learning environment.
Despite the overall excellence, one area worth monitoring is a 2025–2026 5th-grade dip. While 3rd and 4th grade scores remain elite, 5th-grade ELA fell to 79.3% (below the 81.0% district average) and 5th-grade math dropped 11.6 points to 74.1% (below the 77.5% district average). Since these are different student cohorts from the prior year, this may reflect cohort-specific challenges rather than systemic decline. Chronic absenteeism is 9.6%—better than the state rate of 16.4%, but slightly worse than the district's 8.5%, which is somewhat notable given the school's low poverty rate. Ultimately, for parents, Old Greenwich School offers an elite, high-achieving education with small classes and tremendous resources, along with a single 5th-grade trend that simply deserves continued attention.
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