Elementary · Regular · Grades PK to 5
Cos Cob School, Cos Cob, CT
Enrollment and teachers
- Students
- 343
- Teachers (FTE)
- 34.0
- Students per teacher
- 10.1
- Grades
- PK to 5
This school's ratio is 0.8 lower than the district figure of 10.9. The Connecticut average across schools is 12.3. Ratios count all teachers, including specialists, so they are lower than typical class sizes.
School details
- Address
- 300 East Putnam Ave., Cos Cob, CT 06807
- Phone
- (203)869-4670
- District
- Greenwich School District
- County
- Western Connecticut Planning Region
- Level
- Elementary
- Type
- Regular
- Status
- Open
- Charter
- No
- Locale
- Suburb: Large
- NCES school ID
- 090171000296
School meals
- Free lunch
- 46
- Reduced-price lunch
- 9
- Free or reduced-price lunch
- 5516.0% of enrollment.
- Community Eligibility Provision
- No
Schools in the Community Eligibility Provision (CEP) serve free meals to all students, so their free lunch counts often reflect direct certification or total enrollment. Free and reduced lunch shares are not comparable between CEP and non-CEP schools.
Related schools
Other elementary schools in Greenwich School District
- Riverside School 440 students
- North Mianus School 423 students
- Glenville School 411 students
- North Street School 411 students
- Old Greenwich School 385 students
- New Lebanon School 375 students
- International School At Dundee 342 students
- Hamilton Avenue School 299 students
- Parkway School 249 students
- Julian Curtiss School 236 students
We publish official enrollment and staffing data, not ratings or test scores.
Source: NCES Common Core of Data 2024-25 and F-33 finance 2020, via the Urban Institute Education Data Portal. Last reviewed October 2026. Blank values are not available, not applicable or suppressed in the source. See the methodology.