Cos Cob School

Q: Is Cos Cob School a good school?

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

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:
159^th of 497 Connecticut Elementary Schools

Per Pupil Expenditures: $29,199

Students who attend Cos Cob School usually attend:

Middle:	Central Middle School
High:	Greenwich High School

Student/teacher ratio: 8.9

Number of students: 337

Racial breakdown:

White:

66.2%

Hispanic:

14.8%

Asian:

9.5%

Free/discounted lunch recipients: 13.1%

See top rated Connecticut elementary schools

Compare Cos Cob School to nearby elementary schools!

Performance Trends

Compare Details Cos Cob School ranks better than 68% of elementary schools in Connecticut. It also ranks 5^th among 8 ranked elementary schools in the Greenwich School District. (See more...)

Compare Details In 2024 the calculated Average Standard Score was 72. (See more...)

Chronic absenteeism in a school refers to a situation where students repeatedly miss school, with the threshold often defined as missing 10% or more of school days for any reason, excused or unexcused.

Student Body

Compare Details Cos Cob School has the largest elementary school student body size in the Greenwich School District. (See more...)

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Teachers

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Finance

Compare Details The average total spent per student at Cos Cob School is $29,199, which is the 3^rd highest among 8 elementary schools in the Greenwich School District.

Schooldigger 2024 Rankings:

Cos Cob School:

SchoolDigger ranks Cos Cob School 159^th 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 32^nd of 158 Connecticut school districts. (See district ranking list.)

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Rank History for Cos Cob School

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Rank History for all students at Cos Cob School

Year	Avg Standard Score	Statewide Rank	Total # Ranked Elementary Schools	CT State Percentile
2006	69.83	223^rd	570	60.9%
2007	70.65	223^rd	568	60.7%
2008	71.84	201^st	565	64.4%
2009	72.86	190^th	566	66.4%
2010	70.56	212^th	579	63.4%
2011	75.14	158^th	565	72.0%
2012	70.78	210^th	564	62.8%
2013	75.20	164^th	557	70.6%
2015	73.84	177^th	551	67.9%
2016	73.30	150^th	518	71.0%
2017	75.50	147^th	519	71.7%
2018	74.03	156^th	532	70.7%
2019	79.77	123^rd	522	76.4%
2021	81.73	110^th	538	79.6%
2022	75.08	134^th	490	72.7%
2023	76.95	131^st	491	73.3%
2024	72.00	159^th	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	32^nd	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
2018	65.81	109^th	259	57.9%
2019	66.17	100^th	242	58.7%
2021	79.98	93^rd	455	79.6%
2022	69.98	94^th	234	59.8%
2023	75.80	76^th	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
2018	67.38	111^th	262	57.6%
2021	76.91	109^th	445	75.5%
2022	69.60	93^rd	232	59.9%
2023	72.60	82^nd	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
2018	57.24	144^th	296	51.4%
2019	66.55	98^th	295	66.8%
2021	70.55	92^nd	327	71.9%
2022	64.47	105^th	252	58.3%
2023	61.85	116^th	262	55.7%
2024	47.75	162^nd	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.

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	Total
1988	300	2	21	11	0	n/a	n/a	334
1989	311	2	34	8	0	n/a	n/a	355
1990	242	1	26	10	n/a	n/a	n/a	279
1991	219	0	48	5	0	n/a	n/a	272
1992	225	1	42	8	0	n/a	n/a	276
1993	227	2	40	15	0	n/a	n/a	284
1994	338	1	43	25	0	n/a	n/a	407
1995	378	3	61	35	0	n/a	n/a	477
1996	378	3	61	35	0	n/a	n/a	477
1997	369	4	62	42	0	n/a	n/a	477
1998	376	3	62	31	0	n/a	n/a	472
1999	386	4	68	28	0	n/a	n/a	486
2000	379	3	54	29	0	n/a	n/a	465
2001	361	3	67	19	0	n/a	n/a	450
2002	348	4	69	30	0	n/a	n/a	451
2003	348	4	69	30	0	n/a	n/a	451
2004	335	6	65	32	0	n/a	n/a	438
2005	324	7	61	39	1	n/a	n/a	432
2006	343	7	70	52	0	n/a	n/a	472
2007	301	4	70	46	1	n/a	n/a	422
2008	289	3	66	49	0	n/a	n/a	407
2009	300	3	67	45	0	n/a	n/a	415
2010	292	11	66	48	0	n/a	n/a	417
2011	285	12	53	55	0	0	13	418
2012	277	7	49	52	0	0	17	402
2013	305	11	45	52	0	0	21	434
2014	306	8	41	59	0	0	30	444
2015	283	6	48	68	0	0	33	438
2016	280	3	45	77	0	2	30	437
2017	280	2	48	86	0	0	30	446
2018	277	1	36	84	0	0	36	434
2019	258	1	35	82	0	0	35	411
2020	245	1	32	80	0	0	31	389
2021	235	1	34	65	0	0	27	362
2022	225	1	35	67	0	0	31	359
2023	223	4	32	50	0	0	28	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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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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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

Year	Total 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 123^rd of 522 Elementary schools	Ranks 131^st 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)	71.9	64.2	7.7%
3rd Grade English Language Arts (Greenwich School District)	74.8	72.7	2.1%
3rd Grade English Language Arts (Connecticut)	54.3	45.5	8.8%
3rd Grade Mathematics (Cos Cob School)	76.9	69.8	7.1%
3rd Grade Mathematics (Greenwich School District)	76	78.6	2.6%
3rd Grade Mathematics (Connecticut)	55	49.8	5.2%
4th Grade Mathematics (Cos Cob School)	69.4	77.9	8.5%
4th Grade Mathematics (Greenwich School District)	75.9	78.1	2.2%
4th Grade Mathematics (Connecticut)	52.5	48.3	4.2%
5th Grade English Language Arts (Cos Cob School)	71.6	70.7	0.9%
5th Grade English Language Arts (Greenwich School District)	82.5	76.1	6.4%
5th Grade English Language Arts (Connecticut)	58.1	51.3	6.8%
5th Grade Mathematics (Cos Cob School)	76.5	56.9	19.6%
5th Grade Mathematics (Greenwich School District)	71.1	68.5	2.6%
5th Grade Mathematics (Connecticut)	46.5	41.8	4.7%

Student Body

	Number of students Pre-pandemic (2018-2019)	Number of students Post pandemic (2022-2023)	Change (%)
Total Students	411	337	18%
African American	1	4	300%
American Indian	0	0
Asian	35	32	8.6%
Hispanic	82	50	39%
Pacific Islander	0	0
White	258	223	13.6%
Two or More Races	35	28	20%
% Free/Discounted Lunch Recipients	17.5%	13.1%	4.5%

Schools Near Cos Cob School

Choose columns to see: Summary School Students/Teachers Ranking Test Scores Finance All

School													Students/Teachers											Ranking (2024)				Ranking (2023)				NGSS Science (2024)	SBAC English Language Arts (2024)						SBAC Mathematics (2024)					Per Pupil Expenditures (2023)
Name	Type	Grades	Address	City	Zip	County	District	Is Charter	Is Magnet	Is Virtual	Is Title I	Phone	Enrollment	Full-time Teachers	Student/ Teacher Ratio	Free/Discounted Lunch Recipients	White	Black	Hispanic	Asian	American Indian	Pacific Islander	Two or More Races	Average Standard Score (2024)	Statewide Rank (2024)	State Percentile (2024)	SchoolDigger Rating (2024)	Average Standard Score (2023)	Statewide Rank (2023)	State Percentile (2023)	Rank Change from Previous Year	NGSS Science 5th Grade	SBAC English Language Arts 3rd Grade	SBAC English Language Arts 4th Grade	SBAC English Language Arts 5th Grade	SBAC English Language Arts 6th Grade	SBAC English Language Arts 7th Grade	SBAC English Language Arts 8th Grade	SBAC Mathematics 3rd Grade	SBAC Mathematics 4th Grade	SBAC Mathematics 5th Grade	SBAC Mathematics 6th Grade	SBAC Mathematics 7th Grade	Total
Cos Cob School	Public	K-5	300 East Putnam Ave.	Cos Cob	06807	Fairfield County	Greenwich School District	No	No	No	No	(203) 869-4670	337	38	8.9	13.1%	223 (66.2%)	4 (1.2%)	50 (14.8%)	32 (9.5%)	0 (0.0%)	0 (0.0%)	28 (8.3%)	72	159^th of 497 public elementary schools	68.0%		77	131^st of 491 public elementary schools	73.3%	28		58.7		66.2				76.1	60.8	58.8			$29,199
Riverside School	Public	K-5	90 Hendrie Ave.	Riverside	06878	Fairfield County	Greenwich School District	No	No	No	No	(203) 637-1440	435	36	12.1	2.3%	312 (71.7%)	2 (0.5%)	73 (16.8%)	24 (5.5%)	0 (0.0%)	0 (0.0%)	24 (5.5%)	95.8	1^st of 497 public elementary schools	99.8%		96.4	2^nd of 491 public elementary schools	99.6%	1	88.5	87.0	86.3	95.4				87.0	91.3	93.1			$23,458
Julian Curtiss School	Public	PK, KG-5	180 East Elm St.	Greenwich	06830	Fairfield County	Greenwich School District	No	No	No	Yes	(203) 869-1896	241	27	8.8	41.1%	105 (43.6%)	17 (7.1%)	75 (31.1%)	19 (7.9%)	0 (0.0%)	0 (0.0%)	25 (10.4%)	70.1	171^st of 497 public elementary schools	65.6%		56.1	225^th of 491 public elementary schools	54.2%	54	59.5	58.7	70.6	73.8				63.0		52.4			$31,260
International School At Dundee	Public	K-5	55 Florence Rd.	Riverside	06878	Fairfield County	Greenwich School District	No	No	No	No	(203) 637-3800	341	29	11.7	8.5%	160 (46.9%)	6 (1.8%)	61 (17.9%)	86 (25.2%)	0 (0.0%)	0 (0.0%)	28 (8.2%)	90.5	32^nd of 497 public elementary schools	93.6%		91.9	19^th of 491 public elementary schools	96.1%	13		65.5	91.5	92.7				76.4	83.0	85.5			$24,654
North Mianus School	Public	K-5	309 Palmer Hill Rd.	Riverside	06878	Fairfield County	Greenwich School District	No	No	No	No	(203) 637-9730	492	40	12.3	2.6%	319 (64.8%)	2 (0.4%)	64 (13.0%)	72 (14.6%)	1 (0.2%)	0 (0.0%)	34 (6.9%)	95	4^th of 497 public elementary schools	99.2%		94.2	6^th of 491 public elementary schools	98.8%	2	89.5	84.0	86.0	87.2				90.7	91.9				$23,597
North Street School	Public	PK, KG-5	381 North St.	Greenwich	06830	Fairfield County	Greenwich School District	No	No	No	No	(203) 869-6756	387	35	11.0	3.9%	302 (78.0%)	4 (1.0%)	34 (8.8%)	22 (5.7%)	1 (0.3%)	0 (0.0%)	24 (6.2%)	90.9	26^th of 497 public elementary schools	94.8%		92.3	15^th of 491 public elementary schools	96.9%	11	70.0	78.3	85.1	86.0				89.1		78.0			$24,121
Old Greenwich School	Public	PK, KG-5	825 Sound Beach Ave.	Old Greenwich	06870	Fairfield County	Greenwich School District	No	No	No	No	(203) 637-0150	406	35	11.5	1.7%	333 (82.0%)	1 (0.2%)	33 (8.1%)	16 (3.9%)	1 (0.2%)	0 (0.0%)	22 (5.4%)	91.8	20^th of 497 public elementary schools	96.0%		92.3	14^th of 491 public elementary schools	97.1%	6	76.4		89.1	89.1				80.4	89.1	74.5			$23,413
Westover School	Public	K-5	412 Stillwater Ave.	Stamford	06902	Fairfield County	Stamford School District	No	No	No	Yes	(203) 977-4572	532	57	9.3	61.1%	95 (17.9%)	124 (23.3%)	233 (43.8%)	58 (10.9%)	1 (0.2%)	0 (0.0%)	21 (3.9%)	39.1	289^th of 497 public elementary schools	41.9%		43.7	266^th of 491 public elementary schools	45.8%	23	55.4	39.3	50.6	48.6				32.1	48.1	37.8			$24,140
Hamilton Avenue School	Public	PK, KG-5	184 Hamilton Avenue	Greenwich	06830	Fairfield County	Greenwich School District	No	No	No	Yes	(203) 869-1685	294	43	6.9	55.8%	96 (32.7%)	16 (5.4%)	148 (50.3%)	14 (4.8%)	3 (1.0%)	0 (0.0%)	17 (5.8%)	39.7	287^th of 497 public elementary schools	42.3%		37.9	288^th of 491 public elementary schools	41.3%	1		25.6	37.5	61.9						47.6			$32,442
Stamford Charter School for Excellence	Public, Charter	PK, KG-8	1 Schuyler Ave.	Stamford	06902	Fairfield County	Stamford Charter School for Excellence District	Yes	No	No	Yes	(203) 989-0000	561	20	28.0	50.6%	21 (3.7%)	241 (43.0%)	143 (25.5%)	133 (23.7%)	4 (0.7%)	1 (0.2%)	17 (3.0%)	85.5	67^th of 497 public elementary schools	86.5%		87.9	55^th of 491 public elementary schools	88.8%	12		71.7	79.0	76.3	80.8	72.2	60.4	80.0	72.6	57.6	75.0	72.2	$10,994

Frequently Asked Questions about Cos Cob School

What district is Cos Cob School in?

Greenwich School District

What is the racial makeup of Cos Cob School?

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

Is Cos Cob School a good school?

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

How many students attend Cos Cob School?

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

What schools do graduates of Cos Cob School attend?

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.