Enrollment
425
California · 2024-25 NCES data
Other / mixed grade configuration · San Andreas, CA
Mountain Oaks
Federal NCES profile for Mountain Oaks, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 39/100.
2024-25 NCES dataOther / mixed grade configurationNCES 069100308686Charter school
👥 S:T ratio 0
🌟 Gifted program 30
📋 Attendance 88
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Mountain Oaks earns 39/100 on the Resource Investment Index, with class sizes larger than 99% of California schools.
- #2 of 5
- schools in San Andreas · Resource Index
- 39
- Resource Index · Typical
- 53.1:1
- large classes for California
- 48.5%
- free-lunch eligible
Mountain Oaks has class sizes larger than 99% of California schools. Computed live against every California school reporting to NCES.
By Resource Investment Index, Mountain Oaks ranks #2 of 5 schools in San Andreas, CA.
School address
District: Calaveras County Office of Education · California
NCES ID 069100308686 Verify on NCES CCD record →
Teachers (FTE)
8.0
Federal CCD staff survey
Students per teacher
53.1:1
vs 21.5:1 California avg
+147% vs state
Free-lunch eligible
48.5%
vs 55.5% California avg
-13% vs state
Student-teacher ratio in context
How Mountain Oaks compares with California and U.S. medians
What stands out at Mountain Oaks
Mountain Oaks is a mid-sized charter combined-grade school in San Andreas, California, enrolling 425 students.
Class loads run heavy: 53.1:1 is larger than about 99% of California schools and 147% above the 21.5:1 state mean, so each teacher carries more students than is typical.
Economic need runs somewhat below the state's typical profile, with 48.5% of students eligible for free meals.
With 425 students, its enrollment sits close to the California median campus size.
Its Resource Investment Index lands in the upper third of 9,998 scored California schools.
Among 1,346 similarly sized, similarly resourced-need California schools statewide, it ranks #88, a top-tier result once campus size and economic need are matched.
Its student body is led by White (70%) and Hispanic or Latino (20%) (diversity index 47/100).
Attendance holds up well here: only 4.9% of students were chronically absent, below the typical post-pandemic national figure.
The surrounding Calaveras County Office of Education spends $38,896 per pupil, 136% above the California average, a better-resourced district than most.
Among San Andreas's public schools, it stands alongside Calaveras High (703 students): Mountain Oaks is smaller than that campus by headcount and runs heavier classes (53.1:1 vs 19:1).
Calaveras County Office of Education also operates Calaveras River Academy (17 students) and Calaveras County Special Education (Selpa) (13 students) alongside Mountain Oaks.
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 Mountain Oaks compares
Mountain Oaks on the metrics families compare, against California and U.S. means.
| Metric | This school | vs California | California avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 53.1:1 | ▲ 147% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 48.5% | ▼ 13% | 55.5% | 51.7% |
| Enrollment | 425 | top 57% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
53.1:1
Leaner classes than 0% of US schools, heavier class loads than most.
425
Bigger than 51% of US schools by enrollment, mid-sized for the country.
Equity indicators (what these measure)
Economic need
48.5%
free-lunch eligible
- 13% 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
53.1:1
students per teacher
- 147% above state mean
Top 99% in California - lower ratio than 1% of state schools
Well above 20:1, one of the more stretched staffing loads nationally relative to enrollment.
Engagement
4.9%
chronically absent (missed 10%+ of school days)
Below 5%, comfortably under the pre-pandemic national baseline for chronic absenteeism.
Funding equity
$38,896
per pupil, district-wide
- above California avg of $16,509
Well above the U.S. public-school average, reflecting substantially higher local or state investment per enrolled student.
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
White 69.9%
Hispanic or Latino 20.0%
Two or More 7.1%
American Indian / Alaska Native 2.1%
Asian 0.7%
African American 0.2%
Largest group: White at 69.9% of enrollment.
Student-body diversity index 46.6/100
Simpson diversity index - at 46.6, Mountain Oaks is about as mixed as the California school average of 46.0.
Funding & spending
District-wide per-pupil expenditure for Calaveras County Office of Education, which includes Mountain Oaks.
$38,896
Per student
+136%
vs California
Avg $16,509
+134%
vs U.S.
Avg $16,593
Revenue mix
Local 26.8%
State 61.9%
Federal 11.3%
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 Mountain Oaks Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Calaveras River Academy | Smaller | Higher economic need | Lower S:T ratio |
| Calaveras County Special Education (Selpa) | Smaller | Lower economic need | Lower S:T ratio |
| Oakendell Community | Smaller | Higher economic need | Lower S:T ratio |
Comparisons are relative to Mountain Oaks's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 17
- Students per teacher
- 4.3:1
- Resource Index
- 70/100
- Enrollment
- 13
- Students per teacher
- 13:1
- Resource Index
- 26/100
- Enrollment
- 8
- Students per teacher
- 8:1
- Resource Index
- 35/100
Similar other schools in San Andreas
4 comparable other schools (grades Mixed) serving the same city.
Calaveras High
Standard public school
703 students 19:1 students per teacher
Calaveras Unified Alternative-Sierra Hills Education Center
Alternative education program
127 students 31.8:1 students per teacher
Calaveras River Academy
Alternative education program
17 students 4.3:1 students per teacher
Oakendell Community
Alternative education program
8 students 8:1 students per teacher
Similar other 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 (~425 students)
Similar student-teacher ratio (~53.1:1)
Next steps
Verify locally before acting on Mountain Oaks's federal record.
- Compare Mountain Oaks against another school. Compare schools
- Calaveras County Office of Education'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 Mountain Oaks
How many students attend Mountain Oaks?
Mountain Oaks has 425 students enrolled. It is a public school in San Andreas, CA.
What is the student-teacher ratio at Mountain Oaks?
The student-teacher ratio at Mountain Oaks is 53.1:1, which is 147% higher than the California average of 21.5:1 and 238% higher than the national average of 15.7:1.
What percentage of students receive free lunch at Mountain Oaks?
48.5% of students at Mountain Oaks are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Mountain Oaks?
The largest demographic group at Mountain Oaks is White at 69.9% of enrollment, in San Andreas, CA.
What is the Resource Investment Index for Mountain Oaks?
Mountain Oaks has a Resource Investment Index of 39/100 (typical reported resources relative to schools nationally) based on 3 factors: student-teacher ratio, attendance rates. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Mountain Oaks rank among schools in San Andreas?
By Resource Investment Index, Mountain Oaks ranks #2 of 5 schools in San Andreas, CA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all schools in San Andreas on the city page.
Is Mountain Oaks a good school?
Mountain Oaks earns 39/100 on the Resource Investment Index, with class sizes larger than 99% 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 Calaveras County Office of Education?
Besides Mountain Oaks, Calaveras County Office of Education also operates Calaveras River Academy (17 students), Calaveras County Special Education (Selpa) (13 students), and Oakendell Community (8 students). See the Calaveras County Office of Education district page for the complete list.
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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.