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High school · San Mateo Union High School District

Hillsdale High

Hillsdale High serves grades 9–12 for 1,581 students in San Mateo Union High School District.

School calendarAt a glanceDirections

Next day off: Wed, Nov 11 · Veterans Day - District Office and School Sites Closed · All days off

San Mateo Union High School District calendar

Key dates

  1. Veterans Day - District Office and School Sites ClosedWednesday · All dayKey date

Coming up

  1. SMUHSD Board Meeting - Special Budget Study SessionThursday · 7:00 PM · District Office, 650 N. Delaware Street, San Mateo
  2. Mills Drama Presents: PuffsThursday · 7:00 PM · Mills High School Theater, 400 Murchison Drive, Millbrae
  3. Mills Drama Presents: PuffsFriday · 7:00 PM · Mills High School Theater, 400 Murchison Drive, Millbrae
  4. Mills Drama Presents: PuffsSaturday · 2:00 PM · Mills High School Theater, 400 Murchison Drive, Millbrae
  5. Mills Drama Presents: PuffsSaturday · 7:00 PM · Mills High School Theater, 400 Murchison Drive, Millbrae
  6. Equity Advisory Council MeetingThursday · 6:00 PM · District Office, 650 N. Delaware Street, San Mateo
  7. Hillsdale High Drama Presents Legally Blonde, The MusicalThursday · 7:00 PM · Hillsdale High School, 3115 Del Monte Street, San Mateo
  8. Capuchino High Drama presents Shakespeare in LoveThursday · 7:00 PM · Capuchino High School, 1501 Magnolia Drive, San Bruno

Last checked Oct 31, 2026, 3:19 PM. Confirm dates with the district ↗. Recurring calendar entries may not appear here.

Enrollment fell from 1,651 in 2019–20 to 1,581 in 2023–24. Its largest grade in 2023–24 was grade 12, with 417 students. 19% of students qualified for free or reduced-price lunch (295 free, 0 reduced-price). It ran a targeted Title I assistance program in 2019–20. The closest park is West Hillsdale Park (0.3 mi).

At a glance

Hillsdale High by the numbers

Student–teacher ratio is not classroom size.

Grades9–12
Students1,581
Teachers86
Students per teacher18.4
Free or reduced-price lunch19%
School typeRegular School
DistrictSan Mateo Union High School District
Title ITargeted assistance program (2019–20)
Enrollment

Students at Hillsdale High

Students by grade, 2023–24
  • 9371
  • 10393
  • 11400
  • 12417
Total enrollment by school year
  • 2019–201,651
  • 2020–211,689
  • 2021–221,647
  • 2022–231,629
  • 2023–241,581
Nearby

Parks near Hillsdale High

All parks
Park · 0.3 miWest Hillsdale ParkPlaygroundPark · 0.4 miBeresford Recreation CenterPark · 0.4 miBeresford ParkPlayground
Contact

Address, phone and official links

3115 Del Monte St., San Mateo 94403

(650) 558-2699

School website ↗San Mateo Union High School District website ↗California School Dashboard report cards ↗NCES school record ↗Directions ↗

State school ID 4133070 (search it on California School Dashboard) · NCES ID 063498005923

San Mateo Union High School District

Other high schools in the district

All schools
9–12Aragon High1,686 students9–12San Mateo High1,578 students
Nearby

Schools nearby

Middle school · 0.2 miAbbott MiddleGrades 6–8Elementary school · 0.5 miLaurel ElementaryGrades K–5Elementary school · 0.5 miBeresford ElementaryGrades K–5Elementary school · 0.5 miMeadow Heights ElementaryGrades K–5School · 0.6 miSt Gregory SchoolGrades K–8School · 0.7 miPacific Rim Int'L SchoolGrades Pre-K–12

Source: NCES Common Core of Data 2019–20 to 2023–24, via the Urban Institute Education Data Portal; parks from OpenStreetMap. Contact the school or district to confirm enrollment boundaries, schedules and programs.

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