Excellent
#160 of 990 schools in CT
Top 16% in state
Cos Cob School
Elementary School · Greenwich School District
300 East Putnam Ave., Cos Cob, CT 06807
Enrollment
340
Student-Teacher
9.7:1
Score
8.4
Grades
Kindergarten – 5th
Enrollment
340
Student-Teacher
9.7:1
Score
8.4
Grades
Kindergarten – 5th
Data vintage
2022-23
Data vintage2022-23
How this school compares
Connecticut schools
#160 of 990
In district
#11 of 15
Greenwich School District
School environment
9.7 / 10
Excellent
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Cos Cob School
Elementary School in Cos Cob · grades Kindergarten – 5th. Start here, then compare fit against nearby and district options.
Central Middle School
0.7 mi away. Use as a geographic alternative in the same move search.
Greenwich High School
0.8 mi away. Use as a geographic alternative in the same move search.
About Cos Cob School
Cos Cob School is a public elementary school in Cos Cob, CT, part of Greenwich School District. Cos Cob School serves approximately 340 students, and covers grades Kindergarten-5th, and has a 9.7:1 student-teacher ratio. Cos Cob School has a current MySchoolScout rating of 8.4 out of 10 and ranks #160 of 990 schools in CT.
Structured state assessment records for Cos Cob School show 73% math proficiency (multi-year average, 2009-2022) and 74% reading/ELA proficiency (multi-year average, 2009-2022).
- This school 8.4 · Excellent
- District avg 8.8
- CT avg 6.5
What Parents Should Know
At 9.7:1 students to teachers, Cos Cob School sits well below the national average. Smaller classes like that usually mean more one-on-one time between students and teachers.
Score Breakdown
Full Profile · 3/3 metricsView breakdown
View breakdown
View breakdown
Cos Cob School — Students at Cos Cob School score 64% proficient, which is below what's typical for similar communities (expected: 69%).
Equity & Diversity
Shown separately, not included in overall scoreFree/Reduced Lunch
14.1%
Students qualifying for federal meal assistance
Test Scores CT EDFACTS (2021-22)
Based on 26 test records from CT state assessments. About our data
Proficiency Trend
↓ DecliningAverage proficiency (% at or above grade level) across Math & ELA over time.
* COVID-affected year — test participation was uneven nationwide. This data is weighted at 50% in the Growth score calculation.
Source: EdFacts (NCES) and state assessment data. Growth score: 8.7/10.
How Cos Cob School Compares
See how Cos Cob School performs across key quality dimensions compared to state benchmarks.
Funding & Resources
Programs & Offerings
Data as of 2021-22 · Source: CRDC via Urban Institute · Learn more
Location
300 East Putnam Ave., Cos Cob, CT 06807
Nearby Alternatives
Families considering Cos Cob School may also want to explore other elementary schools in the area. Riverside School (rated 9.7/10, 1.1 miles away, in nearby Riverside), which scores notably higher. Another option is International School At Dundee (rated 9.7/10, 1.4 miles away, in nearby Riverside), which scores notably higher. Additionally, North Mianus School (rated 9.6/10, 1.5 miles away, in nearby Riverside), which scores notably higher. For more schools in Cos Cob, see our Cos Cob schools guide .
Nearby Schools
20 within 2.8 mi| School | Distance | Rating |
|---|---|---|
| Central Middle School Greenwich | 0.7 mi | 8.2 |
| Greenwich High School Greenwich | 0.8 mi | 8.7 |
| Eastern Middle School Riverside | 0.9 mi | 9.4 |
| THE GREENWICH COUNTRY DAY SCHOOL Greenwich | 1.0 mi | 5.8 |
| Riverside School Riverside | 1.1 mi | 9.7 |
| Julian Curtiss School Greenwich | 1.2 mi | 7.8 |
| International School At Dundee Riverside | 1.4 mi | 9.7 |
| North Mianus School Riverside | 1.5 mi | 9.6 |
| North Street School Greenwich | 1.7 mi | 9.5 |
| BRUNSWICK SCHOOL Greenwich | 1.5 mi | 6.6 |
| GREENWICH ACADEMY Greenwich | 1.5 mi | 6.7 |
| Old Greenwich School Old Greenwich | 1.7 mi | 9.5 |
| THE GREENWICH JAPANESE SCHOOL Greenwich | 2.0 mi | 6.9 |
| GREENWICH CATHOLIC SCHOOL Greenwich | 2.5 mi | 5.6 |
| Westover School Stamford | 2.3 mi | 6.4 |
| EAGLE HILL SCHOOL Greenwich | 2.3 mi | 8.4 |
| Hamilton Avenue School Greenwich | 2.7 mi | 7.0 |
| Stillmeadow School Stamford | 2.9 mi | 6.4 |
| FUSION ACADEMY - GREENWICH Stamford | 2.6 mi | — |
| Stamford Charter School for Excellence Stamford | 2.8 mi | 5.0 |
Neighborhood Census ACS (2019-2023)
Census data for ZIP 06807 (ACS 2019-2023 5-Year Estimates) · Data sources
Median Income
$194,492
Median Home Value
$1,228,000
Median Rent
$2,622/mo
Population
7,667
College Educated
72.9%
Homeownership
67.9%
Avg Commute
28.9 min
Poverty Rate
5.6%
Median Age
39.3
Similar Schools
Schools in the same state with comparable level, size, and ratings
| School | Rating |
|---|---|
| Aiken School West Hartford, CT | 8.4 |
| Hebron Avenue School Glastonbury, CT | 8.4 |
| Laurel Ledge School Beacon Falls, CT | 8.4 |
| Melissa Jones School Guilford, CT | 8.4 |
| Peck Place School Orange, CT | 8.4 |
| Tootin' Hills School West Simsbury, CT | 8.4 |
Frequently Asked Questions
Common questions about Cos Cob School
What grades does Cos Cob School serve?
Cos Cob School serves students in grades Kindergarten through 5th.
How many students attend Cos Cob School?
Cos Cob School has an enrollment of approximately 340 students.
What is the student-teacher ratio at Cos Cob School?
The student-teacher ratio at Cos Cob School is 9.7:1. A lower ratio generally means more individual attention per student. The national average is approximately 16:1 for public schools.
How does Cos Cob School rank in CT?
Cos Cob School ranks #160 of 990 schools in CT.
What is Cos Cob School's MySchoolScout rating?
Cos Cob School has a current MySchoolScout rating of 8.4 out of 10. This score combines the level-appropriate components shown in the rating breakdown; equity data is shown separately for context.
What are the test scores at Cos Cob School?
Based on loaded state assessment records, Cos Cob School has 73% math proficiency (multi-year average, 2009-2022) and 74% reading/ELA proficiency (multi-year average, 2009-2022).
Is Cos Cob School a charter school?
No, Cos Cob School is not a charter school. It is a traditional public school operated by the local school district.
Is Cos Cob School a Title I school?
No, Cos Cob School is not currently a Title I school.
What does the Free & Reduced Lunch percentage mean for Cos Cob School?
14.1% of students at Cos Cob School qualify for free or reduced-price lunch. This is a commonly used indicator of economic need and provides important context when interpreting test scores.
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Neighborhood Context
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Quick Facts NCES CCD (SY 2022-23)
- Grades
- Kindergarten – 5th
- Enrollment
- 340
- Student-Teacher Ratio
- 9.7:1
- Teachers (FTE)
- 35
- Free/Reduced Lunch
- 14.1%
- Type
- regular
- Setting
- Large Suburb
- County
- Connecticut Planning Region 9
- Chronic Absenteeism (SY 2022-23)
- 10.9%
- Phone
- (203) 869-4670
Resources & Links
District
Greenwich School District- District Enrollment
- 8,589
- Schools in District
- 15
- Per-Pupil Spending
- $31,488
- District Rank
- #11 of 15
Other Schools in This District
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