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Best Elementary Schools in Zip Code 06878

At a glance

Schools

1,205

Students

5-star schools

Top rankedNorth Mianus School1^st of 492 Connecticut elementary schools

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Summary:

Zip code 06878 in Riverside, Connecticut is home to three K–5 elementary schools — Riverside School, North Mianus School, and International School at Dundee — all part of the Greenwich School District, which ranks 14th out of 153 districts in Connecticut. Together, these three schools make 06878 one of the strongest elementary school zip codes in the state: every school is rated 5 stars, and all three rank in the top 17 elementary schools in Connecticut for 2025–2026.

North Mianus School is the current standout, having claimed the #1 spot in Connecticut for two consecutive years (2024–2025 and 2025–2026) after finishing #4 in 2023–2024. It has the lowest student–teacher ratio in the group at 10.2:1 and exceptional math proficiency, including a remarkable 96.5% score in 5th-grade math. Riverside School is right on its heels — it was #1 in Connecticut in 2023–2024 and now sits at #2, with a standout 96.2% 5th-grade ELA proficiency rate and the lowest free/reduced lunch rate in the zip code at just 1.59%. International School at Dundee is a strong school in its own right, ranking #17 in the state (97th percentile), but it trails its two neighborhood peers noticeably across most subjects.

Several interesting patterns stand out. Chronic absenteeism is remarkably low across all three schools at under 5%, compared to a 16.4% state average. Spending does not predict performance here: International School at Dundee spends the most per student ($22,395) yet ranks third in the group, while North Mianus spends the least ($17,213) and ranks first. Student–teacher ratios align with rankings, with North Mianus at 10.2:1, International School at 11.2:1, and Riverside at 11.7:1. Families in 06878 have access to exceptional public elementary education no matter which school their child attends, though North Mianus and Riverside are currently trading places at the very top of the state while International School at Dundee delivers well above-average results for a more economically diverse student population.

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Ranking:

E Elementary M Middle H High A Alternative P Private

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

School													Students/Teachers											Ranking (2026)				Ranking (2025)				NGSS Science (2026)	SBAC English Language Arts (2026)			SBAC Mathematics (2026)			Vaccination (2025-26)		Per Pupil Expenditures (2025)
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/reduced lunch (2024-25)	White	Black	Hispanic	Asian	American Indian	Pacific Islander	Two or More Races	Average Standard Score (2026)	Statewide Rank (2026)	State Percentile (2026)	SchoolDigger Rating (2026)	Average Standard Score (2025)	Statewide Rank (2025)	State Percentile (2025)	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 Mathematics 3rd Grade	SBAC Mathematics 4th Grade	SBAC Mathematics 5th Grade	Vaccination: Kindergartners with all required vaccines	Vaccination: Exemption rate	Total
North Mianus School	Public	K-5	309 Palmer Hill Rd.	Riverside	06878	Western Connecticut Planning Region	Greenwich School District	No	No	No	No	(203) 637-9730	423	41	10.2	2.8%	277 (65.5%)	2 (0.5%)	53 (12.5%)	60 (14.2%)	1 (0.2%)	0 (0.0%)	30 (7.1%)	96.4	1^st of 492 public elementary schools	99.8%		96.3	1^st of 493 public elementary schools	99.8%		89.9	94.9	90.4	89.9	2569.0	91.6	92.4	100%	0%	$25,677
Riverside School	Public	K-5	90 Hendrie Ave.	Riverside	06878	Western Connecticut Planning Region	Greenwich School District	No	No	No	No	(203) 637-1440	440	37	11.7	1.6%	314 (71.4%)	0 (0.0%)	80 (18.2%)	23 (5.2%)	1 (0.2%)	0 (0.0%)	22 (5.0%)	95.6	2^nd of 492 public elementary schools	99.6%		96.1	3^rd of 493 public elementary schools	99.4%	1	85.1	87.5	2584.0	91.9	94.4	2588.0	87.8	100%	0%	$25,196
International School At Dundee	Public	K-5	55 Florence Rd.	Riverside	06878	Western Connecticut Planning Region	Greenwich School District	No	No	No	No	(203) 637-3800	342	30	11.2	10.5%	157 (45.9%)	3 (0.9%)	64 (18.7%)	87 (25.4%)	0 (0.0%)	0 (0.0%)	31 (9.1%)	92.4	17^th of 492 public elementary schools	96.5%		91.6	19^th of 493 public elementary schools	96.1%	2	78.8	87.9	85.5	78.8	2539.0	85.5	86.5	98.3%	0%	$27,915

Cities Near Zip Code 06878

City	Distance	# of Schools	Statewide Rank
Riverside	0.14 mi	4	3^rd
Old Greenwich	0.85 mi	1	4^th
Cos Cob	0.9 mi	1	50^th
Greenwich	1.52 mi	9	28^th
Stamford	1.81 mi	24	152^nd

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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.