What grades does Building 21 Allentown serve?

Building 21 Allentown is a High school serving students in Allentown, PA. The school is part of the local school district.

Where is Building 21 Allentown located?

Building 21 Allentown is located at Allentown, PA in a urban area.

What is the student-teacher ratio at Building 21 Allentown?

Building 21 Allentown has a student-teacher ratio of 15.8:1.

What schools are in Allentown, PA?

Allentown, PA is served by the local school district. Building 21 Allentown is one of the High schools in the area.

PAHighTSICalendar available · 22 events · Auto-updating

Events confirmed from Allentown City SD's official calendar.

Building 21 Allentown — School Calendar 2026-27

Q: How many students attend Building 21 Allentown?

Building 21 Allentown currently enrolls 411 students across High grade levels. The school operates under the local school district in PA.

High|Allentown, Pennsylvania|Allentown City SD

Allentown, PA 18102

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Upcoming Events

Nov

Tue

Professional Learning DayStaff DayDistrict-wide

Nov

Mon

Early Dismissal - Pre K-12 Conferenceshalf_dayDistrict-wide

Nov

Thu

Schools Closed - Thanksgiving HolidayHolidayDistrict-wide

Banks, government offices, and schools may be closed.

Nov

Mon

Schools Closed - Thanksgiving HolidayHolidayDistrict-wide

Banks, government offices, and schools may be closed.

Dec

Wed

Free Cartwheel Webinar - Why the holidays can be hard for kids - and what parents can doHolidayDistrict-wide

Banks, government offices, and schools may be closed.

Dec

Mon

Schools Closed - Winter HolidayHolidayDistrict-wide

Banks, government offices, and schools may be closed.

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School Profile

Grades

9–12

Enrollment

411

Student:Teacher

15.8:1

Locale

Urban

District

Allentown City SD

Econ. Disadvantaged

100.0%

Phone

(484)765-4400

School Statistics

Academics (SY 2020-21)

ELA Proficiency

<50%

Math Proficiency

40-59%

Graduation Rate

75-79%

Chronic Absenteeism

49.2%

SY 2019-20

Programs & Activities (SY 2021-22)

Gifted & Talented

4 students enrolled

Dual Enrollment

54 students enrolled

Student-Teacher Ratio: 19.8:1

Worse than average in PA

Technology & Internet Access (SY 2021-22)

Wi-Fi

Campus-wide wireless

Fiber Internet

High-speed connection

462

Connected devices

Staff & Support Services (SY 2021-22)

Teachers (FTE)

100% fully certified

Counselors

Nurses

Security Staff

Anti-Bullying Policy

District Finance (FY 2023)

Per-Pupil Spending

$18,007

Total current expenditure

Instruction Spending

$11,725

Per pupil, classroom only

Total Revenue/Pupil

$29,055

All funding sources

Funding Sources

Federal 14%State 57%Local 28%

District-level data from NCES F-33 Survey

Community Context

Median Home Value

$349,765

+2.8% 1yr+40.2% 5yr

Allentown, PA metro area

Community Need Level

Moderate

CDC/ATSDR Social Vulnerability Index 2022

Neighborhood Indicators (Census Tract)

19.9%

Below 150% poverty line

5.8%

Unemployment rate

6.5%

Uninsured residents

10.3%

No HS diploma (25+)

Special Education (IDEA)

District-level data from IDEA Part B · Students ages 3-21 served under IDEA

Total Students Served

3,810

Ages 3-21 under IDEA

School-Age (6-21)

3,265

Receiving special ed services

Est. % of Enrollment

100%

District rate, school may vary

Disability Categories (District)

Specific Learning Disability

1,188 (36%)

Autism

718 (22%)

Other Health Impairment

578 (18%)

Speech/Language Impairment

341 (10%)

Emotional Disturbance

181 (6%)

Intellectual Disability

171 (5%)

Source: U.S. Department of Education, IDEA Section 618 Data · District-level counts · Individual school figures may differ

Enrollment Trend (2014-2025)

415

Current enrollment

Stable(-10% 5yr)

Coming Up

Tue, Nov 3, 2026

Professional Learning Day

Staff Day

Mon, Nov 23, 2026

Early Dismissal - Pre K-12 Conferences

half_day

Thu, Nov 26, 2026

Schools Closed - Thanksgiving Holiday

Banks, government offices, and schools may be closed.

Holiday

Full School Calendar 2026-27

Events marked District-wide apply to all schools in Allentown City SD. Building 21 Allentown follows the district calendar.

Date	Event	Type	Level
Fri, Sep 4, 2026	School Closed - Labor Day HolidayDistrict-wide Banks, government offices, and schools may be closed.	Holiday	—
Mon, Sep 7, 2026	Schools Closed - Labor Day HolidayDistrict-wide Banks, government offices, and schools may be closed.	Holiday	—
Tue, Nov 3, 2026	Professional Learning DayDistrict-wide	Staff Day	—
Mon, Nov 23, 2026	Early Dismissal - Pre K-12 ConferencesDistrict-wide	half_day	—
Thu, Nov 26, 2026	Schools Closed - Thanksgiving HolidayDistrict-wide Banks, government offices, and schools may be closed.	Holiday	—
Mon, Nov 30, 2026	Schools Closed - Thanksgiving HolidayDistrict-wide Banks, government offices, and schools may be closed.	Holiday	—
Wed, Dec 9, 2026	Free Cartwheel Webinar - Why the holidays can be hard for kids - and what parents can doDistrict-wide Banks, government offices, and schools may be closed.	Holiday	—
Mon, Dec 21, 2026	Schools Closed - Winter HolidayDistrict-wide Banks, government offices, and schools may be closed.	Holiday	—
Mon, Dec 28, 2026	Schools Closed - Winter HolidayDistrict-wide Banks, government offices, and schools may be closed.	Holiday	—
Fri, Jan 1, 2027	Schools Closed - New Year's HolidayDistrict-wide Banks, government offices, and schools may be closed.	Holiday	—
Mon, Jan 18, 2027	Schools Closed - Dr. Martin Luther King Jr's BirthdayDistrict-wide Banks, government offices, and schools may be closed.	Holiday	—
Mon, Jan 25, 2027	School Closed - Staff Development (Act 80)District-wide	Staff Day	—
Fri, Feb 12, 2027	Schools Closed - Presidents' Day HolidayDistrict-wide Banks, government offices, and schools may be closed.	Holiday	—
Mon, Feb 15, 2027	Schools Closed - Presidents' Day HolidayDistrict-wide Banks, government offices, and schools may be closed.	Holiday	—
Mon, Mar 15, 2027	School Closed - Staff Development (Act 80)District-wide	Staff Day	—
Tue, Mar 23, 2027	Early Dismissal - Pre K-12 Conferences (1/2 Day)District-wide	half_day	—
Thu, Mar 25, 2027	Schools Closed - Spring HolidayDistrict-wide Banks, government offices, and schools may be closed.	Holiday	—
Mon, Mar 29, 2027	Schools Closed - Spring HolidayDistrict-wide Banks, government offices, and schools may be closed.	Holiday	—
Tue, May 18, 2027	Professional Learning DayDistrict-wide	Staff Day	—
Mon, May 31, 2027	Schools Closed - Memorial Day HolidayDistrict-wide Banks, government offices, and schools may be closed.	Holiday	—
Wed, Jun 9, 2027	Early DismissalDistrict-wide	half_day	—
Mon, Jun 14, 2027	Emergency School Closing Make - up Days for ProfessionalsDistrict-wide	Staff Day	—