Building 21 Allentown School
| Name | Building 21 Allentown School |
| Grades | Class 09 to Class 12 |
| Address | 265 Lehigh St |
| City | Allentown |
| School District | Allentown City SD |
| County | Lehigh County |
| Zipcode | 18102 |
| Phone No. | (484)765-4400 |
| State | Pennsylvania |
| City | Midsize |
| Students | 414 |
| Teachers | 30 |
| Student Teacher Ratio | 13.8 students per teacher |
| Charter School | No |
| Magnet School | Yes |
Building 21 Allentown School is located at 265 Lehigh St in Allentown city of Lehigh County county in Pennsylvania. This school comes under Allentown City SD. You can call them at (484)765-4400 for more details. This is a magnet school. Total four hundred fourteen students from class 09 to class 12 study in this school who are taught by thirty teachers. This is not a charter school. The student teacher ratio of this school is 13.8.