- Enrollment
- 451
- Students per teacher
- 22.6:1
- Resource Index
- 24/100
Elementary school (grades K-5) · Petaluma, CA
Sonoma Mountain Elementary
Federal NCES profile for Sonoma Mountain Elementary, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 33/100.
2024-25 NCES dataElementary school (grades K-5)NCES 062832007455Charter school
👥 S:T ratio 0
🌟 Gifted program 70
🎓 Counselors 0
📋 Attendance 61
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Sonoma Mountain Elementary earns 33/100 on the Resource Investment Index, with class sizes larger than 87% of California schools.
- #15 of 25
- elementary schools in Petaluma · Resource Index
- 33
- Resource Index · Typical
- 26.4:1
- large classes for California
- 10.5%
- free-lunch eligible
Sonoma Mountain Elementary has class sizes larger than 87% of California schools. Computed live against every California school reporting to NCES.
By Resource Investment Index, Sonoma Mountain Elementary ranks #15 of 25 elementary schools in Petaluma, CA.
School address
District: Old Adobe Union · California
NCES ID 062832007455 Verify on NCES CCD record →
CCD year-over-year · 2022-23 → 2023-24
+14 students YoY
Sonoma Mountain Elementary held near 451 students from 2022-23 to 2023-24 (+14 headcount).
Teacher FTE added 16.0 → 17.0 across the same CCD years.
Source: NCES Common Core of Data public-school universe (2022-23, 2023-24).
Steady CCD campus
+14 students YoY 062832007455 · Petaluma, CA Elementary · SMALL · CHARTER
422 enr · 26.4:1 · 10.5% lunch · RII 33
Nearest enrollment peer: Loma Vista Immersion Academy (451 students)
Sonoma Mountain Elementary held near 451 students from 2022-23 to 2023-24 (+14 headcount). Teacher FTE added 16.0 → 17.0 across the same CCD years. Read with this school → · District book → · California schools → · Find another →
Sonoma Mountain Elementary in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- Loma Vista Imm
Loma Vista Immersion Academy
451 students
- This school
Sonoma Mountain Elementary
422 students
- La Tercera Ele
La Tercera Elementary
295 students
- Miwok Valley E
Miwok Valley Elementary Charter
288 students
- Old Adobe Elem
Old Adobe Elementary Charter
278 students
What this shows Sonoma Mountain Elementary reports 422 students on the CCD universe file.
How Sonoma Mountain Elementary compares
Sonoma Mountain Elementary held steady on CCD headcount: ratios and free-lunch share vs California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 26.4:1 | ▲ 23% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 10.5% | ▼ 81% | 55.5% | 51.7% |
| Enrollment | 422 | top 57% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
26.4:1
Leaner classes than 4% of US schools, heavier class loads than most.
422
Bigger than 51% of US schools by enrollment, mid-sized for the country.
Equity indicators methodology
Economic need
10.5%
free-lunch eligible
- 81% below the California average of 55.5%
Below the 40% Title I threshold, among the lower-need profiles in the state; federal aid targets individual qualifying students rather than schoolwide programs.
Staffing depth
26.4:1
students per teacher
- 23% above state mean
Top 87% in California - lower ratio than 13% of state schools
Well above 20:1, one of the more stretched staffing loads nationally relative to enrollment.
Engagement
15.6%
chronically absent (missed 10%+ of school days)
In the 15-20% range, nearing the "high" absenteeism threshold.
Funding equity
$16,647
per pupil, district-wide
- below California avg of $18,665
Somewhat below the U.S. average per-pupil spend; funding constraints may affect programs, facilities, and staffing.
Support staff
Counselors0.4 FTE
Student-support staffing from the Civil Rights Data Collection.
Discipline context
2
in-school suspensions + 4 out-of-school
Suspension rate: 0.5 per 100 students. Combined in-school and out-of-school rate: 1.4 per 100 students. Reported via the Civil Rights Data Collection.
Student demographics
White 69.7%
Hispanic or Latino 14.2%
Two or More 10.0%
Asian 5.2%
American Indian / Alaska Native 0.7%
African American 0.2%
Largest group: White at 69.7% of enrollment.
Student-body diversity index 48.1/100
Simpson diversity index - at 48.1, Sonoma Mountain Elementary is more mixed than the California school average of 46.0.
Programs
Gifted & talented Yes
District finance for Old Adobe Union reports $16,647 per pupil (NCES F-33) - open the district page for the full revenue mix.
How Sonoma Mountain Elementary Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Loma Vista Immersion Academy | Similar size | Higher economic need | Lower S:T ratio |
| La Tercera Elementary | Smaller | Higher economic need | Lower S:T ratio |
| Miwok Valley Elementary Charter | Smaller | Higher economic need | Lower S:T ratio |
| Old Adobe Elementary Charter | Smaller | Higher economic need | Lower S:T ratio |
Comparisons are relative to Sonoma Mountain Elementary's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 295
- Students per teacher
- 22.7:1
- Resource Index
- 29/100
- Enrollment
- 288
- Students per teacher
- 19.2:1
- Resource Index
- 36/100
- Enrollment
- 278
- Students per teacher
- 23.2:1
- Resource Index
- 33/100
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
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
Mckinley Elementary
Standard public school
368 students 24.5:1 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 (~422 students)
Frequently asked questions about Sonoma Mountain Elementary
How many students attend Sonoma Mountain Elementary?
Sonoma Mountain Elementary has 422 students enrolled. It is an elementary school in Petaluma, CA. CCD year-over-year: 437 (2022-23) → 451 (2023-24), nearly flat (+14).
What is the student-teacher ratio at Sonoma Mountain Elementary?
The student-teacher ratio at Sonoma Mountain Elementary is 26.4:1, which is 23% higher than the California average of 21.5:1 and 68% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Sonoma Mountain Elementary?
10.5% of students at Sonoma Mountain Elementary are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Sonoma Mountain Elementary?
The largest demographic group at Sonoma Mountain Elementary is White at 69.7% of enrollment, in Petaluma, CA.
What is the Resource Investment Index for Sonoma Mountain Elementary?
Sonoma Mountain Elementary has a Resource Investment Index of 33/100 (typical 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 Sonoma Mountain Elementary rank among elementary schools in Petaluma?
By Resource Investment Index, Sonoma Mountain Elementary ranks #15 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 Old Adobe Union?
Besides Sonoma Mountain Elementary, Old Adobe Union also operates Loma Vista Immersion Academy (451 students), La Tercera Elementary (295 students), and Miwok Valley Elementary Charter (288 students). See the Old Adobe Union district page for the complete list.