Building 21 Allentown
🇺🇸 Official data · 2025Allentown, Pennsylvania 18102 · Allentown City SD
#585 of 618 high schools in Pennsylvania
#15905 of 16,910 nationally
About Building 21 Allentown
Building 21 Allentown is a public high located in Allentown, in the Allentown City SD school district of Pennsylvania, United States. It caters for Grades 9–12. In 2025 it enrolled 415 students. Traditional public schools run by a school district; free to attend.
Its Success Index (US) is 16.1 out of 100, placing it in the lower 50% of high schools in United States and 585th of 618 ranked high schools in Pennsylvania. Its strongest component is students per teacher (41th percentile), and its weakest is community advantage (fewer free/reduced-price lunch) (6th percentile).
Other published figures: enrollment 415.
There are 36 schools in Allentown; Building 21 Allentown ranks 27th of 33 scored schools there.
Success Index (US) breakdown
Each component is a percentile against high schools across United States.
- Math proficiency (30%)17%
- Reading proficiency (30%)27%
- Community advantage (fewer free/reduced-price lunch) (25%)99%
- Students per teacher (15%)16.0
The Success Index (US) summarises published data about a school community. It is not a measure of teaching quality. Read the methodology.
Published measures
All figures published for Building 21 Allentown by the official sources.
- Enrollment
- 415
- Students enrolled in the latest NCES directory year.
- Free/reduced-price lunch
- 99%
- Share of students eligible for free or reduced-price lunch.
- Students per teacher
- 16.0
- Enrollment divided by FTE teachers; not class size.
- Reading proficiency
- 27%
- Share of tested students proficient or above (all students, all grades).
- Math proficiency
- 17%
- Share of tested students proficient or above (all students, all grades).
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Schools near Building 21 Allentown
Closest schools by straight-line distance, with their Success Index (US).
Arts Academy Elementary CS
Allentown · Charter elementary · Grades K–5
425 students · 137 m away
Roberto Clemente CS
Allentown · Charter other · Grades K–12
619 students · 327 m away
Jefferson El Sch
Allentown · Public elementary · Grades K–5
522 students · 908 m away
Central El Sch
Allentown · Public elementary · Grades PK–5
694 students · 944 m away
Harrison-Morton MS
Allentown · Public middle · Grades 6–8
704 students · 1.2 km away
Roosevelt El Sch
Allentown · Public elementary · Grades PK–5
631 students · 1.4 km away
Ruby Bridge Childhood Center
Allentown · Public elementary · Grades PK–K
125 students · 1.5 km away
Brigadier General Anna Mae Hays El Sch
Allentown · Public elementary · Grades K–5
807 students · 1.6 km away
Sheridan El Sch
Allentown · Public elementary · Grades 1–5
591 students · 1.6 km away
Washington El Sch
Allentown · Public elementary · Grades 1–5
362 students · 1.9 km away
Similar schools
Public high schools in Pennsylvania with a comparable Enrollment.
Steel Valley SHS
Munhall · Public high · Grades 9–12
415 students
Brandywine Heights HS
Mertztown · Public high · Grades 9–12
413 students
Montgomery JSHS
Montgomery · Public high · Grades 7–12
417 students
Cambria Heights SHS
Patton · Public high · Grades 9–12
419 students
Saegertown JSHS
Saegertown · Public high · Grades 7–12
411 students
Kutztown Area SHS
Kutztown · Public high · Grades 9–12
420 students
Frequently asked questions
Is Building 21 Allentown a good school?
Building 21 Allentown has a Success Index (US) of 16.1 out of 100 (Lower 50% of high schools in United States) and ranks #585 of 618 in Pennsylvania. The index summarises published data about the school community and, where available, attainment; it does not measure teaching quality, so visit the school and ask about support at your child's level.
Where does Building 21 Allentown rank in Pennsylvania?
Building 21 Allentown ranks #585 of 618 high schools in Pennsylvania and #15905 of 16,910 nationally on the Success Index (US) (2025 data).
How many students attend Building 21 Allentown?
Building 21 Allentown had 415 students in 2025.
Is Building 21 Allentown a elementary school or a high school?
Building 21 Allentown is classified as a high covering Grades 9–12. It is a public school.
What other schools are near Building 21 Allentown?
There are 10 schools within 15 km of Building 21 Allentown; they are listed on this page with their Success Index (US) and distance, and can be compared side by side.