Cos Cob School
Public
Elementary Grades PK–5 Virtual
Part of Greenwich School District
300 East Putnam Ave., Cos Cob, CT 06807 · (203) 869-4670
Community ratings
Not rated yetBe the first neighbor to rate this school — an overall score plus Teachers, Communication, Safety and Activities.
Academic performance
Math proficiency62%
State average 37.9%
Reading / language arts67%
State average 50.7%
EDFacts via Urban Institute Education Data Portal (SY2020-21)
At a glance
343Students enrolled
10:1Student–teacher ratio
16%Free / reduced lunch
SuburbSetting
Regular SchoolSchool type
Enrollment by grade
Pre-K24
Kindergarten52
Grade 152
Grade 260
Grade 358
Grade 450
Grade 547
Students
White · 67%231
Hispanic · 20%70
Asian · 5%18
Two or more races · 5%18
Black · 1%4
American Indian/Alaska Native · 1%2
Counts as reported to NCES; percentages are of students with a reported race/ethnicity.
Enrollment · last 5 years
362’20
359’21
337’22
340’23
343’24
Location
300 East Putnam Ave. Cos Cob
Neighbor reviews
Sign in to rate this school.
School facts from the U.S. Department of Education (NCES), 2024-2025 school year. Academic scores from the EDFacts via Urban Institute Education Data Portal (SY2020-21). Community ratings and reviews reflect neighbor opinions, not an official measure of school quality.