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High school · Allentown, PA

Building 21 Allentown

Grades
9–12
Enrollment (2023-24)
411
Regular attendance
70.4%
District
Allentown

Regular attendance is the share of students present at least 90% of enrolled days (statewide average 79.6%). Source: Pennsylvania Future Ready PA Index, 2024-25; enrollment and grades from the U.S. Department of Education (NCES).

Academic proficiency

Share of students scoring proficient or advanced on Keystone exams (grade 11), Pennsylvania Future Ready PA Index, 2024-25. Black tick = state average.

Mathematics5.3%PA 44.3%
English / Language Arts31.2%PA 62.1%

More on the Allentown School District

See district-wide academics, property taxes by municipality, the family & safety data, and homes for sale on the Allentown district hub.

Common questions

What grades does Building 21 Allentown serve?

Building 21 Allentown is a high school in the Allentown School District, located in Allentown, PA, serving grades 9–12.

How many students attend Building 21 Allentown?

About 411 students are enrolled at Building 21 Allentown (U.S. Department of Education NCES Common Core of Data, 2023-24 school year).

What is the attendance rate at Building 21 Allentown?

70.4% of Building 21 Allentown students are regularly present, enrolled and attending at least 90% of school days, versus 79.6% statewide (Pennsylvania Future Ready PA Index, 2024-25).

How does Building 21 Allentown perform academically?

On Keystone exams (grade 11), 5.3% of Building 21 Allentown students scored proficient or advanced in math, and 31.2% in English/language arts (Pennsylvania Future Ready PA Index, 2024-25). District-wide results are on the Allentown School District page.

Other schools in Allentown

Elementary schools

Brigadier General Anna Mae Hays Elementary SchoolCentral Elementary SchoolHiram W Dodd Elementary SchoolJackson Early Childhood CenterJefferson Elementary SchoolLehigh Parkway Elementary SchoolLuis A. Ramos Elementary SchoolMosser Elementary SchoolMuhlenberg Elementary SchoolRitter Elementary SchoolRoosevelt Elementary SchoolSheridan Elementary SchoolUnion Terrace Elementary SchoolWashington Elementary School

Middle schools

Francis D Raub Middle SchoolHarrison-Morton Middle SchoolSouth Mountain Middle SchoolTrexler Middle School

High schools

Louis E Dieruff High SchoolWilliam Allen High School

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School identity, grades, and enrollment: U.S. Department of Education, NCES Common Core of Data. Regular attendance: Pennsylvania Future Ready PA Index (2024-25). Figures describe the school and may lag by a year or more: context for families, not a rating. Academic and safety detail is on the district hub.