Enrollment
20
California · 2024-25 NCES data
Elementary school (grades K-5) · Petaluma, CA
Cinnabar Elementary
Federal NCES profile for Cinnabar Elementary, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 49/100.
2024-25 NCES dataElementary school (grades K-5)NCES 060870013043
👥 S:T ratio 20
🌟 Gifted program 30
🎓 Counselors 98
📋 Attendance 50
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Cinnabar Elementary earns 49/100 on the Resource Investment Index, with class sizes near the California median. It is also one of the smallest schools in California.
- #2 of 25
- elementary schools in Petaluma · Resource Index
- 49
- Resource Index · Higher
- 20:1
- students per teacher
- 81.0%
- free-lunch eligible
Cinnabar Elementary has class sizes near the California median. Computed live against every California school reporting to NCES.
By Resource Investment Index, Cinnabar Elementary ranks #2 of 25 elementary schools in Petaluma, CA.
School address
District: Cinnabar Elementary · California
NCES ID 060870013043 Verify on NCES CCD record →
Teachers (FTE)
1.0
Federal CCD staff survey
Students per teacher
20:1
vs 21.5:1 California avg
-7% vs state
Free-lunch eligible
81.0%
vs 55.5% California avg
+46% vs state
Student-teacher ratio in context
How Cinnabar Elementary compares with California and U.S. medians
What stands out at Cinnabar Elementary
Cinnabar Elementary is a high-poverty, small elementary school in Petaluma, California, enrolling 20 students.
Class sizes run a bit leaner than typical: 20:1 puts it in the smaller third of California schools by student-teacher ratio.
Economic need runs somewhat above the state's typical profile, with 81.0% of students eligible for free meals.
This is a small campus: fewer students than 97% of California schools, with 20 enrolled.
Its Resource Investment Index outscores 91% of the 9,998 California schools with a score on record, a top-tier result on this measure.
Against 126 statewide peers matched on enrollment and economic need, it ranks mid-pack at #59.
Its student body is led by Hispanic or Latino (75%) and White (20%) (diversity index 40/100).
Counselor coverage is strong, about 11 students per counselor, inside the American School Counselor Association's recommended 250:1.
Attendance runs somewhat below the norm, with 20.0% of students chronically absent per the 2021-22 civil-rights collection.
Among Petaluma's elementary schools, it stands alongside Mary Collins Charter School at Cherry Valley (494 students): Cinnabar Elementary is smaller than that campus by headcount and runs leaner classes (20:1 vs 29.1:1).
Its district, Cinnabar Elementary, also runs Cinnabar Charter (156 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 Elementary compares
Cinnabar Elementary on the metrics families compare, against California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 20:1 | ▼ 7% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 81.0% | ▲ 46% | 55.5% | 51.7% |
| Enrollment | 20 | top 97% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
20:1
Leaner classes than 16% of US schools, heavier class loads than most.
20
Bigger than 3% of US schools by enrollment, a small campus.
Equity indicators (what these measure)
Economic need
81.0%
free-lunch eligible
- 46% above the California average of 55.5%
Above the 40% Title I schoolwide threshold; federal funds support the whole school, not individual students.
Staffing depth
20:1
students per teacher
- 7% below state mean
Top 35% in California - lower ratio than 65% of state schools
Between 16:1 and 20:1, squarely in the typical U.S. public-school staffing range.
Engagement
20.0%
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
Counselors1.8 FTE
Per 11 students, the combined health-and-guidance staffing load for this school.
Discipline context
0
in-school suspensions + 0 out-of-school
Suspension rate: 0.0 per 100 students. Combined in-school and out-of-school rate: 0.0 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 75.0%
White 20.0%
Two or More 5.0%
Largest group: Hispanic or Latino at 75.0% of enrollment.
Student-body diversity index 39.5/100
Simpson diversity index - at 39.5, Cinnabar Elementary 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 Elementary.
$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 Elementary Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Cinnabar Charter | Larger | Lower economic need | Lower S:T ratio |
Comparisons are relative to Cinnabar Elementary's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 156
- Students per teacher
- 17.3:1
- Resource Index
- 31/100
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 (~20 students)
Similar student-teacher ratio (~20:1)
Next steps
Verify locally before acting on Cinnabar Elementary's federal record.
- Compare Cinnabar Elementary 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 Elementary
How many students attend Cinnabar Elementary?
Cinnabar Elementary has 20 students enrolled. It is an elementary school in Petaluma, CA.
What is the student-teacher ratio at Cinnabar Elementary?
The student-teacher ratio at Cinnabar Elementary is 20:1, which is 7% lower than the California average of 21.5:1 and 27% 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 Elementary?
81.0% of students at Cinnabar Elementary are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Cinnabar Elementary?
The largest demographic group at Cinnabar Elementary is Hispanic or Latino at 75.0% of enrollment, in Petaluma, CA.
What is the Resource Investment Index for Cinnabar Elementary?
Cinnabar Elementary has a Resource Investment Index of 49/100 (higher 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 Elementary rank among elementary schools in Petaluma?
By Resource Investment Index, Cinnabar Elementary ranks #2 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 Elementary a good school?
Cinnabar Elementary earns 49/100 on the Resource Investment Index, with class sizes near the California median. It is also one of the smallest schools in California. 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 Elementary, Cinnabar Elementary also operates Cinnabar Charter (156 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.