Enrollment
156
California · 2024-25 NCES data
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 →
Teachers (FTE)
9.0
Federal CCD staff survey
Students per teacher
17.3:1
vs 21.5:1 California avg
-20% vs state
Free-lunch eligible
50.0%
vs 55.5% California avg
-10% vs state
Student-teacher ratio in context
How Cinnabar Charter compares with California and U.S. medians
What stands out at Cinnabar Charter
Cinnabar Charter is a higher-need, small charter elementary school in Petaluma, California, enrolling 156 students.
Class sizes run a bit leaner than typical: 17.3:1 puts it in the smaller third of California schools by student-teacher ratio.
Its free-meal eligibility rate of 50.0% lands close to the California typical range, neither a high- nor low-need campus by this measure.
Enrollment of 156 puts it in the smaller third of California schools by headcount.
Its Resource Investment Index sits near the middle of the pack among 9,998 scored California schools.
Against 350 statewide peers matched on enrollment and economic need, it ranks mid-pack at #213.
Its student body is predominantly Hispanic or Latino (80% of enrollment) (diversity index 34/100).
Counselor coverage is strong, about 186 students per counselor, inside the American School Counselor Association's recommended 250:1.
Chronic absenteeism is elevated: 39.7% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
Among Petaluma's elementary schools, it stands alongside Mary Collins Charter School at Cherry Valley (494 students): Cinnabar Charter is smaller than that campus by headcount and runs leaner classes (17.3:1 vs 29.1:1).
Its district, Cinnabar Elementary, also runs Cinnabar Elementary (20 students).
Sourced from NCES CCD, CRDC, and F-33 (federal records, not a quality verdict). How we source and compute this.
Source: National Center for Education Statistics Common Core of Data + CRDC + F-33 · 2024-25
How Cinnabar Charter compares
Cinnabar Charter on the metrics families compare, against 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 (what these measure)
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
$17,108
per pupil, district-wide
- above California avg of $16,509
Close to the U.S. public-school average per-pupil spend.
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.
Overview
- Common Core of Data (June 2026): enrollment, staffing, and the student-teacher ratio above.
- Civil Rights Data Collection: discipline counts and program access (AP, gifted, special education).
- F-33 School District Finance Survey: the district-wide per-pupil spending figures below.
Three separate federal collections, each on its own reporting cadence - which is why this school's numbers line up on a consistent basis against every other school and state on this site, rather than mixing figures pulled from different survey years.
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
Funding & spending
District-wide per-pupil expenditure for Cinnabar Elementary, which includes Cinnabar Charter.
$17,108
Per student
+4%
vs California
Avg $16,509
+3%
vs U.S.
Avg $16,593
Revenue mix
Local 27.8%
State 65.1%
Federal 7.0%
Source: NCES F-33 School District Finance Survey District-level finance · FY 2021-22 Per-pupil expenditure reflects the district-wide average. Individual school budgets are not reported at the federal level.
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
- Enrollment
- 20
- Students per teacher
- 20:1
- Resource Index
- 49/100
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
Similar elementary schools statewide
Matched by enrollment size and by staffing ratio across all of California, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~156 students)
Next steps
Verify locally before acting on Cinnabar Charter's federal record.
- Compare Cinnabar Charter against another school. Compare schools
- Cinnabar Elementary's spending and staffing shape this school. District profile
- Confirm current enrollment and boundaries with the school. Choosing guide
Federal record (CCD 2024-25, CRDC 2021-22) - PlainSchools assigns no subjective rating; the composite quality score is a transparent, reproducible index computed from this cited federal data.
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.
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, counselor availability, attendance rates. 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.
Is Cinnabar Charter a good school?
Cinnabar Charter earns 31/100 on the Resource Investment Index, even as it posts class sizes smaller than 82% of California schools. This is a resource snapshot, not an academic rating; see the Resource Investment Index question above for what the number does and doesn't measure.
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.
Related tools
Every figure on PlainSchools is rendered directly from the source NCES, CRDC and F-33 federal records, no number is typed in by an editor. Each school's figures reflect its most recent NCES/CRDC submission on file. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error. Data current as of June 2026.