Summary:
Zip code 06378 in Stonington, Connecticut, is served by a single elementary school, Deans Mill School, which educates students in grades PK through 5 and is part of the Stonington School District.
Deans Mill School is a standout performer, ranking in the 80th percentile of Connecticut elementary schools and earning a 4-star rating for 2025–2026. The school consistently outpaces both its district and the state in every tested subject. In 2025–2026, average proficiency rates were 72.3% in English language arts, 74.8% in math, and 64.0% in science — beating the state by margins of 17 to 26 percentage points across most grade levels. Math is a particular strength, with nearly 80% of 4th graders scoring proficient. The school also boasts an exceptionally low chronic absenteeism rate of 4.8%, compared to 13.4% in the Stonington School District and 16.4% statewide. With a favorable 11:1 student-teacher ratio and low poverty rate (12.59% free/reduced lunch), the school is well-resourced and well-supported.
While Deans Mill School remains firmly in the top 20% of elementary schools in Connecticut, it has seen a modest ranking slide recently — from 91st percentile in 2023–2024 to 80th percentile in 2025–2026. Year-to-year scores show some volatility by grade level, such as 5th-grade ELA dropping from 82.9% to 70.7%, but this likely reflects normal cohort differences rather than any systemic decline. The school continues to outperform the district on nearly every measure, making it an excellent choice for families in the area. Because this is the only elementary school in the zip code, there are no direct local comparisons — but against state and district benchmarks, Deans Mill School is clearly a high-performing, well-run school with strong academics, excellent attendance, and dedicated resources.
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