- Enrollment
- 1,658
- Students per teacher
- 22.1:1
- Resource Index
- 33/100
High school (grades 9-12) · Millbrae, CA
Mills High
Federal NCES profile for Mills High, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 38/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 063498005924
👥 S:T ratio 16
🌟 Gifted program 30
🎓 Counselors 38
📋 Attendance 69
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Mills High earns 38/100 on the Resource Investment Index, with class sizes near the California median.
- #1 of 5
- public schools in Millbrae · Resource Index
- 38
- Resource Index · Typical
- 21:1
- students per teacher
- 17.0%
- free-lunch eligible
Mills High has class sizes near the California median. Computed live against every California school reporting to NCES.
By Resource Investment Index, Mills High ranks #1 of 5 public schools in Millbrae, CA.
School address
District: San Mateo Union High · California
NCES ID 063498005924 Verify on NCES CCD record →
CCD year-over-year · 2022-23 → 2023-24
-22 students YoY
Mills High held near 1,119 students from 2022-23 to 2023-24 (-22 headcount).
Teacher FTE added 53.5 → 57.0 across the same CCD years.
Source: NCES Common Core of Data public-school universe (2022-23, 2023-24).
Steady CCD campus
-22 students YoY 063498005924 · Millbrae, CA High · MID · TRAD
1,115 enr · 21:1 · 17.0% lunch · RII 38
Nearest enrollment peer: Aragon High (1,658 students)
Mills High held near 1,119 students from 2022-23 to 2023-24 (-22 headcount). Teacher FTE added 53.5 → 57.0 across the same CCD years. Read with this school → · District book → · California schools → · Find another →
Mills High in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- Aragon High
Aragon High
1,658 students
- Hillsdale High
Hillsdale High
1,585 students
- Burlingame Hig
Burlingame High
1,583 students
- San Mateo High
San Mateo High
1,557 students
- This school
Mills High
1,115 students
- Capuchino High
Capuchino High
1,061 students
What this shows Mills High reports 1,115 students on the CCD universe file.
How Mills High compares
Mills High 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 | 21:1 | ▼ 2% | 21.5:1 | 15.7:1 |
| Free-lunch eligible | 17.0% | ▼ 69% | 55.5% | 51.7% |
| Enrollment | 1,115 | top 9% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
21:1
Leaner classes than 13% of US schools, heavier class loads than most.
1,115
Bigger than 93% of US schools by enrollment, a large campus nationally.
Equity indicators methodology
Economic need
17.0%
free-lunch eligible
- 69% 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
21:1
students per teacher
- 2% below state mean
Top 43% in California - lower ratio than 57% of state schools
Above 20:1, running heavier than the typical U.S. public school; staffing is comparatively stretched.
Engagement
12.6%
chronically absent (missed 10%+ of school days)
In the 10-15% range, above the pre-pandemic national baseline but within the broader post-pandemic picture.
Funding equity
$24,423
per pupil, district-wide
- above California avg of $18,665
Well above the U.S. public-school average, reflecting substantially higher local or state investment per enrolled student.
Support staff
Counselors3.6 FTE
Per 310 students, the combined health-and-guidance staffing load for this school.
Discipline context
7
in-school suspensions + 26 out-of-school
Suspension rate: 0.6 per 100 students. Combined in-school and out-of-school rate: 3.0 per 100 students. Reported via the Civil Rights Data Collection. Includes 1 expulsion.
Student demographics
Asian 58.8%
Hispanic or Latino 20.3%
White 10.7%
Two or More 9.0%
Native Hawaiian / Pacific Islander 1.0%
African American 0.3%
Largest group: Asian at 58.8% of enrollment.
Student-body diversity index 59.3/100
Simpson diversity index - at 59.3, Mills High is more mixed than the California school average of 46.0.
Programs
AP courses offered 18
District finance for San Mateo Union High reports $24,423 per pupil (NCES F-33) - open the district page for the full revenue mix.
How Mills High Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Aragon High | Larger | Similar economic need | Similar S:T ratio |
| Hillsdale High | Larger | Similar economic need | Lower S:T ratio |
| Burlingame High | Larger | Similar economic need | Similar S:T ratio |
| San Mateo High | Larger | Similar economic need | Lower S:T ratio |
| Capuchino High | Similar size | Similar economic need | Lower S:T ratio |
Comparisons are relative to Mills High's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 1,585
- Students per teacher
- 17.2:1
- Resource Index
- 38/100
- Enrollment
- 1,583
- Students per teacher
- 22:1
- Resource Index
- 36/100
- Enrollment
- 1,557
- Students per teacher
- 18.5:1
- Resource Index
- 30/100
- Enrollment
- 1,061
- Students per teacher
- 17.4:1
- Resource Index
- 33/100
Nationwide high 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 (~1,115 students)
Frequently asked questions about Mills High
How many students attend Mills High?
Mills High has 1,115 students enrolled. It is a high school in Millbrae, CA. CCD year-over-year: 1,141 (2022-23) → 1,119 (2023-24), nearly flat (-22).
What is the student-teacher ratio at Mills High?
The student-teacher ratio at Mills High is 21:1, which is 2% lower than the California average of 21.5:1 and 34% 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 Mills High?
17.0% of students at Mills High are eligible for free lunch, compared to the California average of 55.5%.
What is the racial and ethnic makeup of Mills High?
The largest demographic group at Mills High is Asian at 58.8% of enrollment, in Millbrae, CA. Its student body is more racially and ethnically mixed than most US schools, with a diversity index of 59.3/100.
What is the Resource Investment Index for Mills High?
Mills High has a Resource Investment Index of 38/100 (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 Mills High rank among public schools in Millbrae?
By Resource Investment Index, Mills High ranks #1 of 5 public schools in Millbrae, CA. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking. See all public schools in Millbrae on the city page.
What other schools are in San Mateo Union High?
Besides Mills High, San Mateo Union High also operates Aragon High (1,658 students), Hillsdale High (1,585 students), and Burlingame High (1,583 students). See the San Mateo Union High district page for the complete list.