- Enrollment
- 20
- Students per teacher
- 20:1
- Resource Index
- 49/100
Elementary school (grades K-5) · Petaluma, CA
Cinnabar Charter
Federal NCES profile for Cinnabar Charter, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 31/100.
2024-25 NCES dataElementary school (grades K-5)NCES 060870000884Charter school
👥 S:T ratio 31
🌟 Gifted program 30
🎓 Counselors 63
📋 Attendance 1
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Cinnabar Charter earns 31/100 on the Resource Investment Index, even as it posts class sizes smaller than 82% of California schools.
- #18 of 25
- elementary schools in Petaluma · Resource Index
- 31
- Resource Index · Lower
- 17.3:1
- small classes for California
- 50.0%
- free-lunch eligible
Cinnabar Charter has class sizes smaller than 82% of California schools. Computed live against every California school reporting to NCES.
By Resource Investment Index, Cinnabar Charter ranks #18 of 25 elementary schools in Petaluma, CA.
School address
District: Cinnabar Elementary · California
NCES ID 060870000884 Verify on NCES CCD record →
CCD year-over-year · 2022-23 → 2023-24
-26 students YoY
Cinnabar Charter shrank from 186 students in 2022-23 to 160 in 2023-24 (-14.0%).
Teacher FTE added 9.0 → 9.5 across the same CCD years.
Source: NCES Common Core of Data public-school universe (2022-23, 2023-24).
Shrinking CCD campus
-26 students YoY 060870000884 · Petaluma, CA Elementary · SMALL · CHARTER
156 enr · 17.3:1 · 50.0% lunch · RII 31
Nearest enrollment peer: Cinnabar Elementary (20 students)
Cinnabar Charter shrank from 186 students in 2022-23 to 160 in 2023-24 (-14.0%). Teacher FTE added 9.0 → 9.5 across the same CCD years. Read with this school → · District book → · California schools → · Find another →
How Cinnabar Charter compares
Cinnabar Charter is a shrinking campus on CCD: ratios and free-lunch share vs California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 17.3:1 | ▼ 20% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 50.0% | ▼ 10% | 55.5% | 51.7% |
| Enrollment | 156 | top 86% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
17.3:1
Leaner classes than 29% of US schools, heavier class loads than most.
156
Bigger than 15% of US schools by enrollment, a small campus.
Equity indicators methodology
Economic need
50.0%
free-lunch eligible
- 10% below the California average of 55.5%
Above the 40% Title I schoolwide threshold; federal funds support the whole school, not individual students.
Staffing depth
17.3:1
students per teacher
- 20% below state mean
Top 18% in California - lower ratio than 82% of state schools
Between 16:1 and 20:1, squarely in the typical U.S. public-school staffing range.
Engagement
39.7%
chronically absent (missed 10%+ of school days)
At or above 20%, the commonly used threshold for "high" chronic absenteeism, signaling significant barriers to regular attendance.
Funding equity
$19,638
per pupil, district-wide
- above California avg of $18,665
Somewhat above the U.S. public-school average, reflecting higher local or state investment per enrolled student.
Support staff
Counselors0.8 FTE
Student-support staffing from the Civil Rights Data Collection.
Discipline context
0
in-school suspensions + 2 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 1.3 per 100 students. Reported via the Civil Rights Data Collection.
Student demographics
Hispanic or Latino 80.1%
White 14.7%
Two or More 3.2%
African American 0.6%
American Indian / Alaska Native 0.6%
Native Hawaiian / Pacific Islander 0.6%
Largest group: Hispanic or Latino at 80.1% of enrollment.
Student-body diversity index 33.6/100
Simpson diversity index - at 33.6, Cinnabar Charter is less mixed than the California school average of 46.0.
Programs
District finance for Cinnabar Elementary reports $19,638 per pupil (NCES F-33) - open the district page for the full revenue mix.
How Cinnabar Charter Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Cinnabar Elementary | Smaller | Higher economic need | Higher S:T ratio |
Comparisons are relative to Cinnabar Charter's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
Similar elementary schools in Petaluma
6 comparable elementary schools (grades K-5) serving the same city.
Mary Collins Charter School at Cherry Valley
Standard public school
494 students 29.1:1 students per teacher
Loma Vista Immersion Academy
Standard public school
451 students 22.6:1 students per teacher
Sonoma Mountain Elementary
Standard public school
422 students 26.4:1 students per teacher
Corona Creek Elementary
Standard public school
403 students 22.4:1 students per teacher
Grant Elementary
Standard public school
386 students 24.1:1 students per teacher
Meadow Elementary
Standard public school
384 students 24:1 students per teacher
Nationwide elementary schools with similar size or staffing
Out-of-state peers matched by enrollment and by student-teacher ratio, not the same-city or same-district lists above.
Similar enrollment (~156 students)
Frequently asked questions about Cinnabar Charter
How many students attend Cinnabar Charter?
Cinnabar Charter has 156 students enrolled. It is an elementary school in Petaluma, CA. CCD year-over-year: 186 (2022-23) → 160 (2023-24), down 26.
What is the student-teacher ratio at Cinnabar Charter?
The student-teacher ratio at Cinnabar Charter is 17.3:1, which is 20% lower than the California average of 21.5:1 and 10% higher than the national average of 15.7:1. Lower ratios generally mean more individual attention per student.
What percentage of students receive free lunch at Cinnabar Charter?
50.0% of students at Cinnabar Charter are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Cinnabar Charter?
The largest demographic group at Cinnabar Charter is Hispanic or Latino at 80.1% of enrollment, in Petaluma, CA.
What is the Resource Investment Index for Cinnabar Charter?
Cinnabar Charter has a Resource Investment Index of 31/100 (lower reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, gifted-program reporting, counselor availability, chronic absenteeism. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Cinnabar Charter rank among elementary schools in Petaluma?
By Resource Investment Index, Cinnabar Charter ranks #18 of 25 elementary schools in Petaluma, CA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all elementary schools in Petaluma on the city page.
What other schools are in Cinnabar Elementary?
Besides Cinnabar Charter, Cinnabar Elementary also operates Cinnabar Elementary (20 students). See the Cinnabar Elementary district page for the complete list.