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Schools›Massachusetts›Chelsea
SCHOOL COMMUNITY·CHELSEA·NCES 250354000482

Chelsea High

299 Everett Avenue, Chelsea, MA 02150 · (617) 466-5000 · Suffolk County
GRADES 09–12HIGH21-SUBURBREGULAR SCHOOL1,649 STUDENTS
D
allk12 Grade
Scored higher than 8% of Massachusetts public high schools
  • DTest scores Share of students meeting the state standard in reading, math, and other tested subjects, 2023-24 and 2024-25.
  • ·Beats expectations Not available for this school, so the grade uses the other parts.
  • CThree-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 Massachusetts public high schools

Enrollment
1,649
High
DISTRICT 612 · STATE 777
Student : Teacher
13.1:1
126 FTE teachers
DISTRICT 13.4:1 · STATE 23.4:1
Free / Reduced Lunch
,
Title I proxy
Community
5
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 951031%
Grade 1040324%
Grade 1137122%
Grade 1235922%
Ungraded60%
Student demographics
21%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 20% · STATE 65% · US 70%
White
845%
DISTRICT 5% · STATE 51% · US 43%
Hispanic
1,46089%
DISTRICT 89% · STATE 26% · US 30%
Black
724%
DISTRICT 5% · STATE 10% · US 15%
Asian
151%
DISTRICT 1% · STATE 7% · US 6%
Two+
141%
DISTRICT 0% · STATE 5% · US 5%
Native American
10%
DISTRICT 0% · STATE 0% · US 1%
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
89654%
Female
75045%

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Test scores

MCAS 2024-25 . % Meeting or Exceeding Expectations
English Language Arts
21.0%
MA avg 43.8% . -9.0pp since 2018
Math
19.0%
MA avg 42.2% . -9.0pp since 2018

What this means: On the MCAS, Massachusetts's statewide test, about 21 of every 100 students at this school read and write at grade level and about 19 of 100 do math at grade level. Across all Massachusetts schools, those numbers are about 44 and 42. Reading and writing scores are down about 9 points since 2018, while math scores are down about 9 points.

MCAS results by year

School yearEnglish Language ArtsMath
2024-2521.0%19.0%
2023-2429.0%19.0%
2022-2326.0%20.0%
2021-2230.0%29.0%
2020-2127.0%15.0%
2018-1930.0%28.0%
% Meeting or Exceeding Expectations, all students and all tested grades.
Source: MCAS. All students, all grades. See all years and grades →

Where Chelsea High ranks

Among high schools
MeasureThis schoolIn MassachusettsIn Suffolk County
Math proficiency
ranked highest first
19.0%#273 of 327
▲ 10
#12 of 29
no change
Reading proficiency
ranked highest first
21.0%#289 of 326
▼ 13
#13 of 29
▼ 2
3-year test score change
ranked biggest drop first
-9.5pp#86 of 315#6 of 26
Enrollment
ranked largest first
1,649#38 of 379#4 of 43
Students per teacher
ranked fewest first
13.1:1#271 of 325#29 of 35
Diversity index
ranked most diverse first
20.9%#301 of 325#33 of 35
Enrollment change since 2017-18
ranked fastest growth first
+7.2%#79 of 133#12 of 17
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
1,649
+194 (+13%) vs 2020
+51% since 1990-91, when it was 1,089
Student : Teacher
13.1:1
was 14.1:1
Source: NCES Common Core of Data

Enrollment and staffing by year

School yearStudentsTeachers (FTE)Students per teacherFree and reduced lunch
2024-251,649125.713.1:1N/A
2023-241,680116.114.5:1N/A
2022-231,611109.514.7:1N/A
2020-211,45510314.1:1N/A
2017-181,538112.813.6:1N/A
2015-161,52111113.7:1N/A
2010-111,35310712.6:175% (1,016)
2000-011,109N/AN/A74% (825)
1990-911,089N/AN/AN/A
Source: NCES Common Core of Data. Rows are the federal collections on file for Chelsea High.

Since 2017-18: students up 7% (1,538 to 1,649); teachers up 12% (112.8 to 125.7).

About Chelsea High

Chelsea High sits in Chelsea, Massachusetts, and is classified as a high school. Classes run from 9 through 12, and the school has 1,649 students. Against the 777-student average for high schools in Massachusetts, enrollment here is 112% higher.

Chelsea High is one of the 11 schools that make up Chelsea (6,094 students in total).

Hispanic students make up 89% of enrollment at Chelsea High. The next largest groups are 5% White and 4% Black. In Suffolk County overall, about 23% of residents are Hispanic. The school's diversity index is 21%, meaning two students picked at random have a 21% chance of belonging to different racial or ethnic groups.

Chelsea High operates with 125.7 full-time-equivalent teachers, a ratio of about 13.1:1. On average, high schools in Massachusetts have 23.4:1, compared with 13.1:1 here.

Chelsea High is graded D by allk12, scoring above 8% of Massachusetts public high schools once test results, poverty-adjusted performance, and the recent trend are combined.

In Suffolk County (population about 785,121), the median household income is $95,631, the share of adults with a bachelor's degree or higher is 51%, and roughly 11% of residents are in poverty. Chelsea High is one of 157 public schools in the county.

Nearest public school: Chelsea Opportunity Academy, less than a tenth of a mile away. Within five miles are at least 8 other public schools.

For locale, NCES codes Chelsea High as Suburb: Large.

Enrollment climbed 13% from its 2020-21 level of 1,455. The student-to-teacher ratio fell from 14.1:1 in 2020-21 to 13.1:1 in 2024-25.

Topics for discussion here include school events, clubs, and volunteer needs. Alumni can share how the school prepared them.

Suffolk County at a glance

View full county profile
Population
785,121
Census ACS
Median income
$95,631
Household, ACS
Bachelor's+
51%
Adults 25+
Poverty rate
11%
Below federal line
Schools in county
157
75,679 students

Quick facts

School name
Chelsea High
District
Chelsea
Address
299 Everett Avenue, Chelsea, MA 02150
Phone
(617) 466-5000
County
Suffolk County
Level
High
Grade range
09–12
Total enrollment
1,649
Teachers (FTE)
126
Student–teacher ratio
13.1:1
Locale
21-Suburb: Large
NCES ID
250354000482
Charter school
No
Virtual school
No

Related schools

Other schools in Chelsea
Other schools in Chelsea
Other Chelsea High schools

3 other US public schools in 4 states are named Chelsea High. Chelsea High is the largest of the 4.

Nearby schools

Frequently asked questions

About Chelsea High
What is the total enrollment at Chelsea High?
Chelsea High enrolls approximately 1,649 students in grades 09-12.
What grades does Chelsea High serve?
Chelsea High serves grades 09-12.
How many teachers does Chelsea High have?
Chelsea High employs 126 FTE teachers, for a student-to-teacher ratio of 13.1:1.
What is the racial breakdown of students at Chelsea High?
At Chelsea High, the student body is approximately 5% White, 89% Hispanic, 4% Black, 1% Asian, 1% Two or more.
What district is Chelsea High in?
Chelsea High is part of Chelsea.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.
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