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A−

Cos Cob School

PublicElementaryGrades PK–5

300 East Putnam Ave., Cos Cob, CT 06807 · (203) 869-4670 · Part of Greenwich School District

Greenwich’s School Grade A− better than 81% of Connecticut school districts

Directions
Students
343
Students per teacher
10:1
Free or reduced lunch
16%
Setting
Suburb
Grades
PK–5
The gist

What stands out about Cos Cob School

  • Its own letter, A−: reading and math results near the top of Connecticut’s public schools
  • Math proficiency 24 pts above the state
  • Reading / language arts 16 pts above the state
  • Small classes: 10 students per teacher
  • Next stop for Greenwich kids: 3 middle schools

On the path

Where Greenwich kids come from and go next. The whole path →

PK–5Cos Cob SchoolYou are here
6–83 middle schoolsDepends on your address

Test scores

2020–21
Math proficiency62%
State average 37.9%
Reading / language arts67%
State average 50.7%

Its own letter, A−, places these results among Connecticut’s 920 public schools with results. Source: EDFacts via Urban Institute Education Data Portal (SY2020-21).

Location

Directions ↗

300 East Putnam Ave., Cos Cob

Students

Enrollment by grade
Pre-K24
Kindergarten52
Grade 152
Grade 260
Grade 358
Grade 450
Grade 547
Enrollment over time
362’20
359’21
337’22
340’23
343’24

Down 5.2% since 2020–21.

Who goes here
White 67%Hispanic 20%Asian 5%Two or more races 5%Black 1%American Indian/Alaska Native <1%

As reported to NCES, share of students with a reported race or ethnicity.

Parents talk

Questions and answers about Cos Cob School from Greenwich families.

Other schools in Greenwich School District

The district →
North Street School
Elementary · Grades PK–5 · Greenwich
A+
411 students11:1
Old Greenwich School
Elementary · Grades PK–5 · Old Greenwich
A+
385 students11:1
New Lebanon School
Elementary · Grades PK–5 · Greenwich
B−
375 students10:1
Hamilton Avenue School
Elementary · Grades PK–5 · Greenwich
C+
299 students8:1
Julian Curtiss School
Elementary · Grades PK–5 · Greenwich
B
236 students8:1
Riverside School
Elementary · Grades K–5 · Riverside
A+
440 students12:1

School facts: U.S. Department of Education (NCES), 2024–2025 school year. Test scores: EDFacts via Urban Institute Education Data Portal (SY2020-21). A school’s letter is our own summary of its reading and math results against Connecticut’s other public schools; Greenwich’s School Grade is built from its districts’ results. Map: © OpenStreetMap contributors.