Allentow Central Catholic High School.
Private · Grades 9–12 · 627 students
Building 21 Allentown
265 Lehigh St, Allentown, PA 18102
Grades
9–12
High
Students
415
Enrolled 2024–25
Students per teacher
16 : 1
Full-time teachers
District
Allentown City SD
Lehigh County
Schola Grade D · Below average
Letter grade (A–F) · compared with 629 Pennsylvania high schools · How we grade
Percentiles compare this school with other Pennsylvania high schools; the line marks the middle. Data: test scores 2021–22, graduation and absenteeism 2022–23 (U.S. Department of Education, EDFacts); coursework 2023–24 (Civil Rights Data Collection); staffing 2024–25 (NCES).
About Building 21 Allentown
Building 21 Allentown is a magnet high school in Allentown, Pennsylvania, serving grades 9–12. It is part of Allentown City SD. The school is located in a midsize city in Lehigh County.
In the 2024–25 school year, 415 students were enrolled, with about 16 students for every full-time teacher. That ratio is larger than the typical Pennsylvania high school (13.3 students per teacher). Its Schola Grade is D (below average), compared with 629 Pennsylvania high schools.
Grades & enrollment
Students per grade, 2024–25Grades 9–12
Location & nearby schools
School details
- Type
- Magnet School · What this means
- Level
- High
- Grades offered
- 9–12
- Enrollment (2024–25)
- 415 students
- Students per teacher
- 16 to 1
- AP courses offered
- 7
- Charter school
- No
- Magnet school
- Yes
- Virtual learning
- Offers virtual courses
- Locale
- City — Midsize
- School district
- Allentown City SD
- County
- Lehigh County
- NCES school ID
- 420228007623
Schools near Building 21 Allentown
All 46 schools in Allentown →
William Allen HS
Public · Grades 9–12 · 3,074 students
Salisbury SHS
Public · Grades 9–12 · 546 students
Louis E Dieruff HS
Public · Grades 9–12 · 1,914 students
Whitehall HS
Public · Grades 9–12 · 1,462 students
Emmaus HS
Public · Grades 9–12 · 2,842 students
School data comes from the U.S. Department of Education: the National Center for Education Statistics (NCES) Common Core of Data and EDGE school locations (2024–25) and Private School Survey (2023–24), the Civil Rights Data Collection (2023–24), and EDFacts (test results 2021–22; graduation and chronic absenteeism 2022–23), plus other public sources. Please contact the school to confirm enrollment, programs, and other details. How we source data.