Cos Cob School

Virtual

Regular School · Cos Cob, CT

Cos Cob School is a regular school school in Cos Cob, Connecticut, serving grades PK–05 with 343 students enrolled (SY 2024-2025). The student-teacher ratio is 10:1.

Level

Elementary

Grades

PK – 05

Enrollment

343

Teachers (FTE)

34.3

Student–Teacher Ratio

10:1

Status

Open

Lunch Program Participation

Yes participating without using any Provision or the CEO

Student Demographics (SY 2024-2025)

Race / Ethnicity	Students	Share
White	231	67%
Hispanic/Latino	70	20%
Asian	18	5%
Two or more races	18	5%
Black or African American	4	1%
American Indian / Alaska Native	2	1%
Total enrollment	343	182M / 161F

English Language Learners: 41 (12% of enrollment) · SY 2021–22

Academic Performance (SY 2021-2022)

Metric	This School	State Avg	Tested
Math Proficiency	60-64%	38.3%	194
Reading Proficiency	65-69%	50.2%	194
Science Proficiency	60-69%	—	57

Source: EDFacts, SY 2020–2021. Suppressed values (e.g. <=10%) indicate fewer than the minimum reportable threshold.

Stanford Achievement Estimate

Pooled score across SY 2009–2022 (grades 3–8), expressed in grade levels relative to the national average. Positive = above average.

Overall (Math + ELA)

+0.45 grade levels

Math

-0.18 grade levels

Programs & Discipline

Gifted & Talented

Program offered

36 students enrolled

Out-of-School Suspensions

Chronically Absent

2.6% of enrollment · SY 2019–20

Source: Civil Rights Data Collection (CRDC), Office for Civil Rights & EDFacts.

Lunch Program (SY 2024-2025)

Category	Students	% of School
Total enrollment (est.)	343	100%

Contact & Location

300 East Putnam Ave.

Cos Cob, CT 06807

Phone: (203)869-4670

http://www.greenwichschools.org/cos-cob-school

District

Greenwich School District

Per-pupil expenditure: $34,300

District enrollment: 8,469

Other Schools in District

Glenville School Elementary
Hamilton Avenue School Elementary
International School At Dundee Elementary
Julian Curtiss School Elementary
New Lebanon School Elementary
North Mianus School Elementary
North Street School Elementary
Old Greenwich School Elementary

View all 14 schools →

Related Data

Neighborhood demographics (ZIP 06807) → CensusDepth.com
Connecticut population & income data → CensusDepth.com
Connecticut teacher salaries → WageDepth.com

NCES ID

090171000296

Data sources: NCES CCD SY 2024-2025 (directory, staff, lunch), EDFacts SY 2020-21 (assessments), CRDC SY 2021-22 (programs & discipline), SEDA v6.0 (achievement estimates). Updated annually. NCES CCD