Total enrollment
8,736
-434 (-5%) vs SY 2020-21
8 schools in San Mateo Union High
California · 8,736 students · 4 cities
From elementary through high school, San Mateo Union High runs 8 public K-12 schools (8 high), with combined enrollment of about 8,736.
4-year change in San Mateo Union High
SY 2020-21 vs SY 2024-25School count
8
+1 (+14%) vs SY 2020-21
Source: NCES Common Core of Data, enrollment-weighted demographic averages
How San Mateo Union High ranks
Among districts| Measure | This district | In California | In the US |
|---|---|---|---|
| State test proficiency ranked highest first | 61.0% | #84 of 534 | N/A |
| Enrollment ranked largest first | 8,736 | #174 of 587 | #1,072 of 9,234 |
| Number of schools ranked most first | 8 | #303 of 587 | N/A |
| Students per teacher ranked fewest first | 19.8:1 | #135 of 587 | #8,325 of 9,044 |
| Free or reduced-price lunch share ranked highest first | 24.9% | #511 of 587 | #7,074 of 8,164 |
| Diversity index ranked most diverse first | 72.5% | #22 of 530 | #180 of 6,853 |
Districts need at least 2 schools and 500 students to be ranked. Test proficiency is ranked within the state only, since each state gives a different test. Each rank links to the full list.
Inside San Mateo Union High
State test results across the district's 6 scored schools run from Burlingame High at 74.2% proficient to Capuchino High at 40.4%, a gap of 33.8 points. That is the 188th widest gap among 458 California districts with four or more scored schools.
Since 2017-18, the 7 district schools that reported both years went from 8,887 to 8,682 students (down 2%) and from 437 to 437 full-time teachers (unchanged), as of 2024-25.
Proficient is the average share of students meeting the state standard across each school's state tests in 2023-24 and 2024-25; schools with fewer than 100 students and schools serving specialized populations are left out. Staffing figures come from the NCES Common Core of Data and count only schools that reported students and teachers in both years.
| Name | City | Level | Grades | Enrollment |
|---|---|---|---|---|
| Aragon High | San Mateo | High | 09-12 | 1,658 |
| Hillsdale High | San Mateo | High | 09-12 | 1,585 |
| Burlingame High | Burlingame | High | 09-12 | 1,583 |
| San Mateo High | San Mateo | High | 09-12 | 1,557 |
| Mills High | Millbrae | High | 09-12 | 1,115 |
| Capuchino High | San Bruno | High | 09-12 | 1,061 |
| Peninsula High (Continuation) | Burlingame | High | 09-12 | 123 |
| The Bridge Academy | San Mateo | High | 10-12 | 54 |
About San Mateo Union High
Across 8 schools, San Mateo Union High educates about 8,736 students in California. By footprint it is a rural-scale district.
Per-school enrollment averages around 1,092 in this district, meaningfully above the California typical of 578.
Five-year track record. Combined enrollment now sits at 8,736 students, declined 5% from the 9,170 reported in SY 2020-21. Over that span, San Mateo Union High gained 1 school, going from 7 to 8.
On this page, the community for San Mateo Union High discusses open enrollment windows, redistricting talk, and busing logistics. Discussions cut across districts, schools, and grade levels.