Enrollment
799
Texas · 2024-25 NCES data
Other / mixed grade configuration · Granbury, TX
Mambrino School
Federal NCES profile for Mambrino School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 33/100.
2024-25 NCES dataOther / mixed grade configurationNCES 482139007659
👥 S:T ratio 48
🌟 Gifted program 70
🎓 Counselors 0
📋 Attendance 13
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Mambrino School earns 33/100 on the Resource Investment Index, with class sizes near the Texas median.
- #4 of 5
- schools in Granbury · Resource Index
- 33
- Resource Index · Typical
- 12.9:1
- students per teacher
- 47.4%
- free-lunch eligible
Mambrino School has class sizes near the Texas median. Computed live against every Texas school reporting to NCES.
By Resource Investment Index, Mambrino School ranks #4 of 5 schools in Granbury, TX.
School address
Teachers (FTE)
62.0
Federal CCD staff survey
Students per teacher
12.9:1
vs 14.7:1 Texas avg
-12% vs state
Free-lunch eligible
47.4%
vs 61.9% Texas avg
-23% vs state
Student-teacher ratio in context
How Mambrino School compares with Texas and U.S. medians
What stands out at Mambrino School
Mambrino School is a mid-sized combined-grade school in Granbury, Texas, enrolling 799 students.
Class sizes run a bit leaner than typical: 12.9:1 puts it in the smaller third of Texas schools by student-teacher ratio.
Economic need runs somewhat below the state's typical profile, with 47.4% of students eligible for free meals.
Enrollment of 799 puts it in the larger third of Texas schools by headcount.
Its Resource Investment Index lands in the lower third of 8,960 scored Texas schools.
Among 1,186 similarly sized, similarly resourced-need Texas schools statewide, it ranks #1,072, in the lower tier once campus size and economic need are matched.
Its student body is led by White (73%) and Hispanic or Latino (21%) (diversity index 42/100).
Counselor access is stretched at roughly 799 students per counselor, well above the ASCA-recommended 250:1 ceiling.
Chronic absenteeism is elevated: 34.9% of students missed 10% or more of school days (2021-22 Civil Rights Data Collection).
The surrounding Granbury Isd spends $10,259 per pupil, 25% below the Texas average, a leaner-resourced district than most.
Granbury Isd also operates Granbury H S (2,215 students) and Acton Middle (938 students) alongside Mambrino School.
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 Mambrino School compares
Mambrino School on the metrics families compare, against Texas and U.S. means.
| Metric | This school | vs Texas | Texas avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 12.9:1 | ▼ 12% | 14.7:1 | 15.7:1 |
| Free-lunch eligible | 47.4% | ▼ 23% | 61.9% | 51.7% |
| Enrollment | 799 | top 19% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
12.9:1
Leaner classes than 68% of US schools, among the more generously staffed nationally.
799
Bigger than 85% of US schools by enrollment, a large campus nationally.
Equity indicators (what these measure)
Economic need
47.4%
free-lunch eligible
- 23% below the Texas average of 61.9%
Above the 40% Title I schoolwide threshold; federal funds support the whole school, not individual students.
Staffing depth
12.9:1
students per teacher
- 12% below state mean
Top 33% in Texas - lower ratio than 67% of state schools
Well under the widely cited 15:1 individualized-attention benchmark, among the leaner class loads nationally.
Engagement
34.9%
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
$10,259
per pupil, district-wide
- below Texas avg of $13,644
Well below the U.S. average per-pupil spend, a notably leaner funding position that may affect programs, facilities, and staffing.
Support staff
Counselors1.0 FTE
Per 799 students, the combined health-and-guidance staffing load for this school.
Discipline context
6
in-school suspensions + 5 out-of-school
Suspension rate: 0.8 per 100 students. Combined in-school and out-of-school rate: 1.4 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
White 72.7%
Hispanic or Latino 21.3%
Two or More 4.0%
African American 0.9%
Asian 0.8%
Native Hawaiian / Pacific Islander 0.3%
American Indian / Alaska Native 0.1%
Largest group: White at 72.7% of enrollment.
Student-body diversity index 42.4/100
Simpson diversity index - at 42.4, Mambrino School is less mixed than the Texas school average of 44.7.
Programs
Gifted & talented Yes
Funding & spending
District-wide per-pupil expenditure for Granbury Isd, which includes Mambrino School.
$10,259
Per student
-25%
vs Texas
Avg $13,644
-38%
vs U.S.
Avg $16,593
Revenue mix
Local 77.8%
State 8.6%
Federal 13.6%
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 Mambrino School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Granbury H S | Larger | Similar economic need | Similar S:T ratio |
| Acton Middle | Similar size | Similar economic need | Higher S:T ratio |
| Granbury Middle | Similar size | Higher economic need | Higher S:T ratio |
| Acton El | Similar size | Similar economic need | Higher S:T ratio |
| John and Lynn Brawner El | Similar size | Higher economic need | Higher S:T ratio |
Comparisons are relative to Mambrino School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 2,215
- Students per teacher
- 14.3:1
- Resource Index
- 39/100
- Enrollment
- 938
- Students per teacher
- 14.7:1
- Resource Index
- 44/100
- Enrollment
- 890
- Students per teacher
- 14.8:1
- Resource Index
- 31/100
- Enrollment
- 841
- Students per teacher
- 15.3:1
- Resource Index
- 37/100
- Enrollment
- 751
- Students per teacher
- 14.4:1
- Resource Index
- 38/100
Similar other schools statewide
Matched by enrollment size and by staffing ratio across all of Texas, not just this city - a different peer set than the local comparisons above.
Similar enrollment (~799 students)
Similar student-teacher ratio (~12.9:1)
Next steps
Verify locally before acting on Mambrino School's federal record.
- Compare Mambrino School against another school. Compare schools
- Granbury Isd'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 Mambrino School
How many students attend Mambrino School?
Mambrino School has 799 students enrolled. It is a public school in Granbury, TX.
What is the student-teacher ratio at Mambrino School?
The student-teacher ratio at Mambrino School is 12.9:1, which is 12% lower than the Texas average of 14.7:1 and 18% lower 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 Mambrino School?
47.4% of students at Mambrino School are eligible for free lunch, compared to the Texas average of 61.9%.
What is the racial and ethnic makeup of Mambrino School?
The largest demographic group at Mambrino School is White at 72.7% of enrollment, in Granbury, TX.
What is the Resource Investment Index for Mambrino School?
Mambrino School has a Resource Investment Index of 33/100 (typical 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 Mambrino School rank among schools in Granbury?
By Resource Investment Index, Mambrino School ranks #4 of 5 schools in Granbury, TX. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all schools in Granbury on the city page.
Is Mambrino School a good school?
Mambrino School earns 33/100 on the Resource Investment Index, with class sizes near the Texas median. 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 Granbury Isd?
Besides Mambrino School, Granbury Isd also operates Granbury H S (2,215 students), Acton Middle (938 students), and Granbury Middle (890 students). See the Granbury Isd 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.