- Enrollment
- 2,215
- Students per teacher
- 14.3:1
- Resource Index
- 39/100
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
CCD year-over-year · 2022-23 → 2023-24
-56 students YoY
Mambrino School shrank from 886 students in 2022-23 to 830 in 2023-24 (-6.3%).
Teacher FTE lost 62.5 → 54.5 across the same CCD years.
Source: NCES Common Core of Data public-school universe (2022-23, 2023-24).
Shrinking CCD campus
-56 students YoY 482139007659 · Granbury, TX Other · MID · TRAD
799 enr · 12.9:1 · 47.4% lunch · RII 33
Nearest enrollment peer: Granbury H S (2,215 students)
Mambrino School shrank from 886 students in 2022-23 to 830 in 2023-24 (-6.3%). Teacher FTE lost 62.5 → 54.5 across the same CCD years. Read with this school → · District book → · Texas schools → · Find another →
Mambrino School in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- Granbury H S
Granbury H S
2,215 students
- Acton Middle
Acton Middle
938 students
- Granbury Middl
Granbury Middle
890 students
- Acton El 841
Acton El
841 students
- This school 799
Mambrino School
799 students
- John and Lynn 751
John and Lynn Brawner El
751 students
What this shows Mambrino School reports 799 students on the CCD universe file.
How Mambrino School compares
Mambrino School is a shrinking campus on CCD: ratios and free-lunch share vs 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 methodology
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
$10,649
per pupil, district-wide
- below Texas avg of $14,348
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.
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
District finance for Granbury Isd reports $10,649 per pupil (NCES F-33) - open the district page for the full revenue mix.
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
- 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
Nationwide other 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 (~799 students)
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. CCD year-over-year: 886 (2022-23) → 830 (2023-24), down 56.
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, gifted-program reporting, counselor availability, chronic absenteeism. 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.
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.