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SCHOOL COMMUNITY·SAN MATEO UNION HIGH·NCES 063498005926

San Mateo High

506 North Delaware St., San Mateo, CA 94401 · (650) 558-2399 · San Mateo County
GRADES 09–12HIGH12-CITYREGULAR SCHOOL1,557 STUDENTS
B
allk12 Grade
Scored higher than 55% of California public high schools
  • A-Test scores Share of students meeting the state standard in reading, math, and other tested subjects, 2023-24 and 2024-25.
  • C+Beats expectations How far test scores land above or below what the share of low-income students predicts for a school in this state.
  • C-Three-year trend Change in reading and math proficiency over the last three test years.

Grades compare a school only with schools in the same state, because every state gives its own test. How grades work · Top-graded California public high schools

Enrollment
1,557
High
DISTRICT 1,092 · STATE 838
Student : Teacher
19.5:1
80 FTE teachers
DISTRICT 18.0:1 · STATE 18.2:1
Free / Reduced Lunch
38%
593 students
DISTRICT 35% · STATE 65%
Community
6
0 members
Enrollment and student:teacher ratio compared against other high schools. Free/Reduced Lunch and demographics compared against all schools.

Enrollment by grade, 2024-25

GradeStudentsShare
Grade 942727%
Grade 1037924%
Grade 1135723%
Grade 1239425%
Student demographics
67%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 72% · STATE 62% · US 70%
White
24716%
DISTRICT 24% · STATE 20% · US 43%
Hispanic
73947%
DISTRICT 35% · STATE 56% · US 30%
Black
151%
DISTRICT 1% · STATE 5% · US 15%
Asian
40526%
DISTRICT 29% · STATE 12% · US 6%
Two+
1178%
DISTRICT 9% · STATE 6% · US 5%
Pacific Islander
302%
DISTRICT 2% · STATE 0% · US 0%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
Male
74748%
Female
80652%

Discussions

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Test scores

CAASPP 2024-25 . % met or exceeded standard
English Language Arts
63.3%
CA avg 49.1% . -6.7pp since 2014
Math
44.3%
CA avg 37.7% . -3.7pp since 2014

What this means: On the CAASPP, California's statewide test, about 63 of every 100 students at this school read and write at grade level and about 44 of 100 do math at grade level. Across all California schools, those numbers are about 49 and 38. Reading and writing scores are down about 7 points since 2014, while math scores are down about 4 points.

Performance levels, 2024-25

SubjectStandard ExceededStandard MetStandard Nearly MetStandard Not Met
English Language Arts39.7%23.6%18.2%18.5%
Math25.6%18.7%15.9%39.8%
Share of tested students at each CAASPP level. Each student counts in one level, so a row adds to about 100%.

CAASPP results by year

School yearEnglish Language ArtsMath
2024-2563.3%44.3%
2023-2466.5%42.9%
2022-2358.8%38.1%
2021-2268.3%44.9%
2018-1968.0%50.3%
2017-1861.1%44.9%
2016-1764.5%42.3%
2015-1676.0%53.0%
2014-1570.0%48.0%
% met or exceeded standard, all students and all tested grades.
Source: CAASPP. All students, all grades. See all years and grades →

BeatsExpectations

Demographically-adjusted score · methodology
Tier
AS EXPECTED
Performing as predicted given the school's student profile
Actual proficiency
54.2%
composite math + reading, all grades
Predicted
57.2%
based on CA schools with similar FRL share
Beats by
-3.0pp
below demographic expectation

What this means: About 54% of students here test proficient in math and reading, compared with the roughly 57% typical for California schools with a similar share of low-income students. BeatsExpectations measures results against demographically similar schools rather than by raw scores, and this school falls within the typical range, neither among California's top nor bottom 10%.

BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →

Schools most like San Mateo High

San Mateo High's state test result (54.2% proficient) is higher than 2 of the 5 schools below with a result.

SchoolStudentsLow-incomeProficient
San Mateo High this school1,55738.1%54.2%
Torrance High
Torrance
1,87936.4%65.6%
Newark Memorial High
Newark
1,36738.9%40.6%
Brea Olinda High
Brea
1,67641.6%58.0%
Capuchino High
San Bruno
1,06134.2%40.4%
Westmont High
Campbell
1,68242.0%58.8%
Matched among California high schools on enrollment, the share of students from low-income families (eligible for free or reduced-price lunch), and racial and ethnic makeup. Proficient is the average share of students meeting the state standard across all of the school's state tests in 2023-24 and 2024-25, the same combined score our test-score rankings use. Online schools and schools serving specialized populations are not matched.

Where San Mateo High ranks

Among high schools
MeasureThis schoolIn CaliforniaIn San Mateo County
State test proficiency
ranked highest first
54.2%#260 of 1,052#7 of 17
Math proficiency
ranked highest first
44.3%#224 of 1,056
▼ 3
#6 of 17
▲ 1
Reading proficiency
ranked highest first
63.3%#393 of 1,056
▼ 88
#10 of 17
▼ 2
3-year test score change
ranked biggest drop first
-2.8pp#217 of 1,044#9 of 17
Enrollment
ranked largest first
1,557#541 of 2,093#8 of 35
Students per teacher
ranked fewest first
19.5:1#484 of 1,352#14 of 23
Diversity index
ranked most diverse first
67.4%#191 of 1,351#9 of 23
Free and reduced lunch
ranked highest share first
38.1%#1,314 of 1,575#14 of 28
Enrollment change since 2017-18
ranked steepest decline first
-6.5%#574 of 802#13 of 14
Ranked against other public high schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.

4-year change

SY 2020-21 vs SY 2024-25
Enrollment
1,557
-114 (-7%) vs 2020
+28% since 1990-91, when it was 1,221
Student : Teacher
19.5:1
was 19.7:1
Source: NCES Common Core of Data

Enrollment and staffing by year

School yearStudentsTeachers (FTE)Students per teacherFree and reduced lunch
2024-251,55779.819.5:138% (593)
2023-241,57887.718.0:128% (445)
2022-231,61384.619.1:129% (474)
2020-211,6718519.7:134% (573)
2017-181,66582.620.1:137% (608)
2015-161,6157820.7:128% (450)
2010-111,348N/AN/A29% (386)
2000-011,4566522.4:12% (30)
1990-911,2215323.0:1N/A
Source: NCES Common Core of Data. Rows are the federal collections on file for San Mateo High.

Since 2017-18: students down 6% (1,665 to 1,557); teachers down 3% (82.6 to 79.8).

About San Mateo High

San Mateo High is a public high school run by San Mateo Union High in San Mateo, California. The school enrolls 1,557 students, from grades 9 through 12. An average school in this group (high schools in California) has about 838 students.

San Mateo High is in San Mateo Union High, a district with 8,736 students across 8 schools.

At San Mateo High, the largest share of students is Hispanic, at 47%. It is also 26% Asian, 16% White, and 8% multiracial. For comparison, the population of San Mateo County is roughly 25% Hispanic. San Mateo High's diversity index is 67%, against a US figure of 70%.

A ratio of 19.5:1 comes from the school's 79.8 full-time-equivalent teachers. That is 1.3 students per teacher above the 18.2:1 average for high schools in California. Free or reduced-price lunch eligibility was 38% in 2024-25.

allk12 grades San Mateo High a B. The grade compares the school only with California public high schools, because each state gives its own test.

Schools in California with a similar free or reduced-price lunch share are predicted to score about 57.2%. San Mateo High scores 54.2%.

Census Bureau estimates for San Mateo County show that the median household income is $158,855, 54% of adults hold a bachelor's degree or higher, and about 4% of people live in poverty. San Mateo High is one of 176 public schools in the county.

The Bridge Academy is the nearest neighboring public school, less than a tenth of a mile away. The five-mile area around San Mateo High holds at least 8 other public schools. Ranking the closest schools with test data puts San Mateo High at 6th of 8.

Federal records code the school's setting as City: Mid-size.

Compared with 2020-21, the school had 114 fewer students in 2024-25.

Conversations here can range across school safety, transportation, and start times. Posting is open to anyone connected to the school.

San Mateo County at a glance

View full county profile
Population
742,340
Census ACS
Median income
$158,855
Household, ACS
Bachelor's+
54%
Adults 25+
Poverty rate
4%
Below federal line
Schools in county
176
82,403 students

Quick facts

School name
San Mateo High
District
San Mateo Union High
Address
506 North Delaware St., San Mateo, CA 94401
Phone
(650) 558-2399
County
San Mateo County
Level
High
Grade range
09–12
Total enrollment
1,557
Teachers (FTE)
80
Student–teacher ratio
19.5:1
Free and reduced lunch
593 (38%)
Locale
12-City: Mid-size
NCES ID
063498005926
Charter school
No
Virtual school
No

Related schools

Other schools in San Mateo Union High
Other schools in San Mateo
Nearby schools

Frequently asked questions

About San Mateo High
How many students attend San Mateo High?
San Mateo High enrolls approximately 1,557 students in grades 09-12.
What grades does San Mateo High serve?
San Mateo High serves grades 09-12.
What is the student-teacher ratio at San Mateo High?
The student-to-teacher ratio at San Mateo High is approximately 19.5:1 (80 FTE teachers).
What is the student diversity at San Mateo High?
Student demographics at San Mateo High are roughly 16% White, 47% Hispanic, 1% Black, 26% Asian, 8% Two or more.
Is San Mateo High public or private?
San Mateo High is a public K-12 school, overseen by San Mateo Union High.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.
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