Cobblestone Elementary vs Rio Del Oro Elementary
A head-to-head comparison of two elementary schools in California, United States, 1.1 km apart, using official American 2025 data. The better value in each row is highlighted.
Cobblestone Elementary
Plumas Lake · Public elementary · Grades K–5
590 students
Rio Del Oro Elementary
Plumas Lake · Public elementary · Grades K–5
564 students
| Measure | Cobblestone Elementary Plumas Lake, California | Rio Del Oro Elementary Plumas Lake, California |
|---|---|---|
| Success Index (US) | 52 Top 50% | 66 Top 50% |
| State rank | #1787 of 5,693 | #1067 of 5,693 |
| National rank | #23752 of 50,301 | #14204 of 50,301 |
| Sector | Public | Public |
| Type | Elementary | Elementary |
| Year range | Grades K–5 | Grades K–5 |
| Students | 590 | 564 |
| Enrollment | 590 | 564 |
| Free/reduced-price lunch | 44.4% | 43.6% |
| Students per teacher | 22.7 | 21.7 |
| Reading proficiency | 52% | 68% |
| Math proficiency | 52% | 64% |
| city | Plumas Lake | Plumas Lake |
| state | California | California |
| Website | – | – |
The verdict
- •Rio Del Oro Elementary scores higher on the Success Index (US) (65.9 vs 52.0).
- •Rio Del Oro Elementary does better on math proficiency (64% vs 52%).
- •Rio Del Oro Elementary does better on reading proficiency (68% vs 52%).
- •Rio Del Oro Elementary does better on community advantage (fewer free/reduced-price lunch) (43.6% vs 44.4%).
- •Rio Del Oro Elementary does better on students per teacher (21.7 vs 22.7).
- •Cobblestone Elementary is the larger school with 590 students compared with 564.
The Success Index (US) summarises published results and context from official data. It does not measure teaching quality or fit. Methodology.
Free academic assessment
Torn between two schools? Start with your child.
Whichever you choose, a free Success Tutoring assessment shows exactly where your child is in English and Maths and how to get ahead before the next school year.
- Personalised learning plan mapped to the Australian Curriculum
- English & Maths from Kindergarten to Year 12
- Flexible memberships, no lock-in contracts
- Centres across NSW, VIC, QLD, WA, SA and ACT
Frequently asked questions
Is Cobblestone Elementary better than Rio Del Oro Elementary?
On the Success Index (US), Rio Del Oro Elementary ranks higher (65.9 vs 52.0 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 Cobblestone Elementary and Rio Del Oro Elementary?
About 1.1 km in a straight line, between Plumas Lake and Plumas Lake in California.
Which has the better Enrollment?
Cobblestone Elementary: 590. Rio Del Oro Elementary: 564. Students enrolled in the latest NCES directory year.
How do Cobblestone Elementary and Rio Del Oro Elementary rank in California?
Cobblestone Elementary is 1787th of 5,693 and Rio Del Oro Elementary is 1067th of 5,693 among elementary schools in California on the 2025 Success Index (US).