Cos Cob School

Summary:

Cos Cob School is an elementary school in Cos Cob, Connecticut, serving 337 students from kindergarten to 5th grade. As part of the Greenwich School District, which is ranked 32 out of 158 districts in the state, Cos Cob School stands out as a high-performing institution with a diverse student population.

Cos Cob School consistently outperforms the state average on standardized tests, with 66.2% of 5th-grade students proficient or better in English Language Arts, compared to the state average of 51.4%. The school also excels in serving its special education students, ranking 32 out of 371 Connecticut elementary schools in this category. Additionally, Cos Cob School has a relatively low student-teacher ratio, ranging from 8.9 to 11.6 over the past three school years, which is lower than many nearby schools like Hamilton Avenue School and Julian Curtiss School.

While Cos Cob School has a predominantly White student population, it is more diverse than some of the other nearby schools, such as North Mianus School and North Street School. Additionally, Cos Cob School has a lower percentage of free and reduced lunch recipients, ranging from 13.06% to 17.13% over the past three school years, compared to higher rates at schools like Hamilton Avenue School (55.78%) and Julian Curtiss School (41.08%).


Detail:

Public K-5

 300 East Putnam Ave.
       Cos Cob, CT  06807


(203) 869-4670

District: Greenwich School District

SchoolDigger Rank:
159th of 497 Connecticut Elementary Schools

Per Pupil Expenditures:  $29,199 Help


Students who attend Cos Cob School usually attend:

Middle:    Central Middle School
High:    Greenwich High School

Student/teacher ratio:  8.9 Help
Number of students:  337

Racial breakdown:

White:
66.2%
Hispanic:
14.8%
Asian:
9.5%
more

Free/discounted lunch recipients:  13.1% Help


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Performance Trends
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Compare Details Cos Cob School ranks better than 68% of elementary schools in Connecticut. It also ranks 8th among 11 ranked elementary schools in the Greenwich School District. (See more...)
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Compare Details In 2024 the calculated Average Standard Score was 72. (See more...)
Student Body
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Compare Details Racial makeup is: White (66.2%), Hispanic (14.8%), Asian (9.5%). (See more...)
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Compare Details 13.1% of students are receiving a free or discounted lunch. (See more...)
Teachers
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Compare Details The student/teacher ratio at Cos Cob School is 8.9, which is the 3rd best among 11 elementary schools in the Greenwich School District. (See more...)
Help
Compare Cos Cob School employs 37.8 full-time teachers.
Finance
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Compare Details The average total spent per student at Cos Cob School is $29,199, which is the 3rd highest among 11 elementary schools in the Greenwich School District.
Schooldigger 2024 Rankings:

Cos Cob School:

SchoolDigger ranks Cos Cob School 159th of 497 Connecticut public elementary schools. (See Cos Cob School in the ranking list.)

Elementary School Test Score Ratings by Student Subgroup:


White students:


Greenwich School District:

SchoolDigger ranks Greenwich School District 32nd of 158 Connecticut school districts. (See district ranking list.)


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Rank History for Cos Cob School

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Compare

Rank History for all students at Cos Cob School

Year Avg Standard Score Statewide Rank Total # Ranked Elementary Schools CT State Percentile SchoolDigger Rating
2006 69.83 223rd 570 60.9%
2007 70.65 223rd 568 60.7%
2008 71.84 201st 565 64.4%
2009 72.86 190th 566 66.4%
2010 70.56 212th 579 63.4%
2011 75.14 158th 565 72.0%
2012 70.78 210th 564 62.8%
2013 75.20 164th 557 70.6%
2015 73.84 177th 551 67.9%
2016 73.30 150th 518 71.0%
2017 75.50 147th 519 71.7%
2018 74.03 156th 532 70.7%
2019 79.77 123rd 522 76.4%
2021 81.73 110th 538 79.6%
2022 75.08 134th 490 72.7%
2023 76.95 131st 491 73.3%
2024 72.00 159th 497 68.0%
See the entire list of Connecticut Elementary School Rankings!

Rank History for Special Education students at Cos Cob School

Year Avg Standard Score Statewide Rank Total # Ranked Elementary Schools CT State Percentile SchoolDigger Rating
2021 85.57 32nd 371 91.4%
See the entire list of Best Connecticut Elementary Schools for Special Education Students!

Rank History for Female students at Cos Cob School

Year Avg Standard Score Statewide Rank Total # Ranked Elementary Schools CT State Percentile SchoolDigger Rating
2018 65.81 109th 259 57.9%
2019 66.17 100th 242 58.7%
2021 79.98 93rd 455 79.6%
2022 69.98 94th 234 59.8%
2023 75.80 76th 230 67.0%
See the entire list of Best Connecticut Elementary Schools for Female Students!

Rank History for Male students at Cos Cob School

Year Avg Standard Score Statewide Rank Total # Ranked Elementary Schools CT State Percentile SchoolDigger Rating
2018 67.38 111th 262 57.6%
2021 76.91 109th 445 75.5%
2022 69.60 93rd 232 59.9%
2023 72.60 82nd 231 64.5%
See the entire list of Best Connecticut Elementary Schools for Male Students!

Rank History for White students at Cos Cob School

Year Avg Standard Score Statewide Rank Total # Ranked Elementary Schools CT State Percentile SchoolDigger Rating
2018 57.24 144th 296 51.4%
2019 66.55 98th 295 66.8%
2021 70.55 92nd 327 71.9%
2022 64.47 105th 252 58.3%
2023 61.85 116th 262 55.7%
2024 47.75 162nd 250 35.2%
See the entire list of Best Connecticut Elementary Schools for White Students!

Data source: test scores: Connecticut Department of Education, rankings: SchoolDigger.com

As you review the school rankings data, please be aware that some of the information from certain demographics is missing. The reason for this omission is that the data has been redacted from the source data itself due to low population samples in these specific demographic groups.

Redacting data from low population samples is a necessary step to ensure the reliability and accuracy of the results, as small sample sizes may not be representative of the broader population. Additionally, this measure helps protect the privacy of individuals belonging to these demographic groups.

Cos Cob School Test Scores
Tests: 
  
Grades: 
  
Years: 
  
Group by: 
District Scores:
State Scores:    
  
Subgroup: 





Data source: Connecticut State Department of Education

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Enrollment information for Cos Cob School

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Year White African American Asian Hispanic American Indian Pacific Islander Two or More Races Not Specified Total
1988 300 2 21 11 0 n/a n/a 0 334
1989 311 2 34 8 0 n/a n/a 0 355
1990 242 1 26 10 n/a n/a n/a 0 279
1991 219 0 48 5 0 n/a n/a 0 272
1992 225 1 42 8 0 n/a n/a 0 276
1993 227 2 40 15 0 n/a n/a 0 284
1994 338 1 43 25 0 n/a n/a 0 407
1995 378 3 61 35 0 n/a n/a 0 477
1996 378 3 61 35 0 n/a n/a 0 477
1997 369 4 62 42 0 n/a n/a 0 477
1998 376 3 62 31 0 n/a n/a 0 472
1999 386 4 68 28 0 n/a n/a 0 486
2000 379 3 54 29 0 n/a n/a 0 465
2001 361 3 67 19 0 n/a n/a 0 450
2002 348 4 69 30 0 n/a n/a 0 451
2003 348 4 69 30 0 n/a n/a 0 451
2004 335 6 65 32 0 n/a n/a 0 438
2005 324 7 61 39 1 n/a n/a 0 432
2006 343 7 70 52 0 n/a n/a 0 472
2007 301 4 70 46 1 n/a n/a 0 422
2008 289 3 66 49 0 n/a n/a 0 407
2009 300 3 67 45 0 n/a n/a 0 415
2010 292 11 66 48 0 n/a n/a 0 417
2011 285 12 53 55 0 0 13 0 418
2012 277 7 49 52 0 0 17 0 402
2013 305 11 45 52 0 0 21 0 434
2014 306 8 41 59 0 0 30 0 444
2015 283 6 48 68 0 0 33 0 438
2016 280 3 45 77 0 2 30 0 437
2017 280 2 48 86 0 0 30 0 446
2018 277 1 36 84 0 0 36 0 434
2019 258 1 35 82 0 0 35 0 411
2020 245 1 32 80 0 0 31 0 389
2021 235 1 34 65 0 0 27 0 362
2022 225 1 35 67 0 0 31 0 359
2023 223 4 32 50 0 0 28 0 337

Data source: National Center for Education Statistics, U.S. Dept of Education.

About Enrollment/Ethnicity

For more information about how the Department of Education defines ethnicity, see Defining Race and Ethnicity Data, National Center for Education Statistics

Students eligible for free or discounted lunch at Cos Cob School

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Compare
Year # Students Full-time Teachers Student/Teacher ratio % Free/Discounted Lunch
1988 334 27.0 12.3 n/a
1989 355 31.2 11.3 n/a
1990 279 25.6 10.8 n/a
1991 272 20.2 13.4 n/a
1992 276 24.0 11.5 2.5
1993 284 22.8 12.5 0.4
1994 407 27.8 14.6 6.6
1995 477 28.0 17.0 6.1
1996 477 28.0 17.0 6.1
1997 477 34.2 13.9 3.1
1998 472 32.9 14.3 3.2
1999 486 36.8 13.2 5.8
2000 465 38.9 12.0 4.5
2001 450 37.4 12.0 n/a
2002 451 35.0 12.9 3.5
2003 451 35.0 12.9 3.5
2004 438 34.9 12.6 4.3
2005 432 30.0 14.4 n/a
2006 472 29.8 15.8 2.1
2007 422 27.6 15.3 5
2008 407 31.6 12.9 4.9
2009 415 34.2 13.7 4.8
2010 417 34.1 12.2 7.4
2011 418 35.1 11.9 8.9
2012 402 34.1 11.7 9.7
2013 434 36.1 12.0 9.4
2014 444 35.4 12.5 9.2
2015 438 35.0 12.5 9.4
2016 437 33.0 13.2 9.4
2017 446 36.5 12.2 11.9
2018 434 37.8 11.4 12.7
2019 411 35.1 11.7 17.5
2020 389 33.0 11.7 16.5
2021 362 31.1 11.6 17.1
2022 359 31.6 11.3 15
2023 337 37.8 8.9 13.1

Data source: National Center for Education Statistics, U.S. Dept of Education.

About Students eligible for discounted/free lunch:

The National School Lunch Program (NSLP) provides low-cost or free meals to students in U.S. public and nonprofit private schools based on household income. Those with incomes below 130% of the poverty line receive free lunch, while those between 130% and 185% qualify for reduced-price lunch. The percentage of students receiving free or reduced-price lunch serves as a marker for poverty, as it reflects the socioeconomic status of families in a given school or district. A higher FRPL rate typically indicates a higher concentration of low-income families, suggesting that the school or district may face additional challenges in providing adequate resources and support for student success.

Student/Teacher Ratio Cos Cob School

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Compare
Year # Students Full-time Teachers Student/Teacher ratio % Free/Discounted Lunch
1988 334 27.0 12.3 n/a
1989 355 31.2 11.3 n/a
1990 279 25.6 10.8 n/a
1991 272 20.2 13.4 n/a
1992 276 24.0 11.5 2.5
1993 284 22.8 12.5 0.4
1994 407 27.8 14.6 6.6
1995 477 28.0 17.0 6.1
1996 477 28.0 17.0 6.1
1997 477 34.2 13.9 3.1
1998 472 32.9 14.3 3.2
1999 486 36.8 13.2 5.8
2000 465 38.9 12.0 4.5
2001 450 37.4 12.0 n/a
2002 451 35.0 12.9 3.5
2003 451 35.0 12.9 3.5
2004 438 34.9 12.6 4.3
2005 432 30.0 14.4 n/a
2006 472 29.8 15.8 2.1
2007 422 27.6 15.3 5
2008 407 31.6 12.9 4.9
2009 415 34.2 13.7 4.8
2010 417 34.1 12.2 7.4
2011 418 35.1 11.9 8.9
2012 402 34.1 11.7 9.7
2013 434 36.1 12.0 9.4
2014 444 35.4 12.5 9.2
2015 438 35.0 12.5 9.4
2016 437 33.0 13.2 9.4
2017 446 36.5 12.2 11.9
2018 434 37.8 11.4 12.7
2019 411 35.1 11.7 17.5
2020 389 33.0 11.7 16.5
2021 362 31.1 11.6 17.1
2022 359 31.6 11.3 15
2023 337 37.8 8.9 13.1

Data source: National Center for Education Statistics, U.S. Dept of Education.

About Student-Teacher Ratio

Student/teacher ratio is calculated by dividing the total number of students by the total number of full-time equivalent teachers. Please note that a smaller student/teacher ratio does not necessarily translate to smaller class size. In some instances, schools hire teachers part time, and some teachers are hired for specialized instruction with very small class sizes. These and other factors contribute to the student/teacher ratio. Note: For private schools, Student/teacher ratio may not include Pre-Kindergarten.
Finances

Per Pupil Expenditures for Cos Cob School

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YearTotal Expenditures Per Pupil
2018 $20,112
2019 $22,254
2020 $21,997
2021 $24,060
2022 $26,255
2023 $29,199

Data source: Connecticut Department of Education
Pre and Post Pandemic Data

Impact of COVID-19 on Cos Cob School

The coronavirus has had a profound impact on education in America. Learning shifted online overnight, attendance numbers dwindled, and enrollment decreased. SchoolDigger.com is making it easier for you to better assess how COVID-19 has impacted your school. Through the collection of pre-pandemic (2019) and current data, SchoolDigger.com is sharing test scores, enrollment numbers and school demographics from schools across the country – and we make it easy to see how impacted schools compare locally and statewide.

Rankings

Rank
Pre-pandemic (2018-2019)
Rank
Post pandemic (2022-2023)
Change (%)
Ranks 123rd of 522 Elementary schoolsRanks 131st of 491 Elementary schools
 3.1%

Test Scores

% proficient
Pre-pandemic (2018-2019)
% proficient
Post pandemic (2022-2023)
Change (%)
3rd Grade English Language Arts (Cos Cob School)71.964.2
 7.7%
   3rd Grade English Language Arts (Greenwich School District)74.872.7
 2.1%
   3rd Grade English Language Arts (Connecticut)54.345.5
 8.8%
3rd Grade Mathematics (Cos Cob School)76.969.8
 7.1%
   3rd Grade Mathematics (Greenwich School District)7678.6
 2.6%
   3rd Grade Mathematics (Connecticut)5549.8
 5.2%
4th Grade Mathematics (Cos Cob School)69.477.9
 8.5%
   4th Grade Mathematics (Greenwich School District)75.978.1
 2.2%
   4th Grade Mathematics (Connecticut)52.548.3
 4.2%
5th Grade English Language Arts (Cos Cob School)71.670.7
 0.9%
   5th Grade English Language Arts (Greenwich School District)82.576.1
 6.4%
   5th Grade English Language Arts (Connecticut)58.151.3
 6.8%
5th Grade Mathematics (Cos Cob School)76.556.9
 19.6%
   5th Grade Mathematics (Greenwich School District)71.168.5
 2.6%
   5th Grade Mathematics (Connecticut)46.541.8
 4.7%

Student Body

Number of students
Pre-pandemic (2018-2019)
Number of students
Post pandemic (2022-2023)
Change (%)
Total Students411337
 18%
African American14
 300%
American Indian00
Asian3532
 8.6%
Hispanic8250
 39%
Pacific Islander00
White258223
 13.6%
Two or More Races3528
 20%
% Free/Discounted Lunch Recipients17.5%13.1%
 4.5%


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Frequently Asked Questions about Cos Cob School

In the 2022-23 school year, 337 students attended Cos Cob School.

Students at Cos Cob School are 66% White, 15% Hispanic, 9% Asian, 8% Two or more races, 1% African American.

Cos Cob School ranks 159th of 497 Connecticut elementary schools. SchoolDigger rates this school 3 stars out of 5.

Students who attend Cos Cob School usually go on to attend:

Middle : Central Middle School
High : Greenwich High School


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SchoolDigger data sources: National Center for Education Statistics, U.S. Department of Education, the U.S. Census Bureau and the Connecticut Department of Education.

IMPORTANT DISCLAIMERS: Not all boundaries are included. We make every effort to ensure that boundaries are up-to-date. But it's important to note that these are approximations and are for general informational purposes only. To verify legal descriptions of boundaries or school locations, contact your local tax assessor's office and/or school district.





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