Cos Cob School vs Riverside School
A head-to-head comparison of two elementary schools in Connecticut, United States, 1.7 km apart, using official American 2025 data. The better value in each row is highlighted.
Cos Cob School
Cos Cob · Public elementary · Grades PK–5
343 students
Riverside School
Riverside · Public elementary · Grades K–5
440 students
| Measure | Cos Cob School Cos Cob, Connecticut | Riverside School Riverside, Connecticut |
|---|---|---|
| Success Index (US) | 89 Top 5% | 96 Top 5% |
| State rank | #74 of 596 | #7 of 596 |
| National rank | #908 of 50,301 | #38 of 50,301 |
| Sector | Public | Public |
| Type | Elementary | Elementary |
| Year range | Grades PK–5 | Grades K–5 |
| Students | 343 | 440 |
| Enrollment | 343 | 440 |
| Free/reduced-price lunch | 16% | 1.6% |
| Students per teacher | 10.1 | 11.9 |
| Reading proficiency | 72% | 92% |
| Math proficiency | 74% | 88% |
| city | Cos Cob | Riverside |
| state | Connecticut | Connecticut |
| Website | – | – |
The verdict
- •Riverside School scores higher on the Success Index (US) (96.4 vs 89.4).
- •Riverside School does better on math proficiency (88% vs 74%).
- •Riverside School does better on reading proficiency (92% vs 72%).
- •Riverside School does better on community advantage (fewer free/reduced-price lunch) (1.6% vs 16%).
- •Cos Cob School does better on students per teacher (10.1 vs 11.9).
- •Riverside School is the larger school with 440 students compared with 343.
The Success Index (US) summarises published results and context from official data. It does not measure teaching quality or fit. Methodology.
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Frequently asked questions
Is Cos Cob School better than Riverside School?
On the Success Index (US), Riverside School ranks higher (96.4 vs 89.4 out of 100). The index is built from published results and context data, not from teaching quality or fit, so visit both schools before deciding.
How far apart are Cos Cob School and Riverside School?
About 1.7 km in a straight line, between Cos Cob and Riverside in Connecticut.
Which has the better Enrollment?
Cos Cob School: 343. Riverside School: 440. Students enrolled in the latest NCES directory year.
How do Cos Cob School and Riverside School rank in Connecticut?
Cos Cob School is 74th of 596 and Riverside School is 7th of 596 among elementary schools in Connecticut on the 2025 Success Index (US).