Southwestern High School
| Name | Southwestern High School |
| Grades | Class 09 to Class 12 |
| Address | PO Box 100 |
| City | Piasa |
| School District | Southwestern CUSD 9 |
| County | Macoupin County |
| Zipcode | 62079-0100 |
| Phone No. | (618)372-3813 |
| State | Illinois |
| Rural | Distant |
| Students | 419 |
| Teachers | 0 |
| Student Teacher Ratio | 0 students per teacher |
| Charter School | No |
| Magnet School | N/A |
Southwestern High School is located at PO Box 100 in Piasa city of Macoupin County county in Illinois. This school comes under Southwestern CUSD 9. You can call them at (618)372-3813 for more details. This is not a magnet school. Total four hundred nineteen students from class 09 to class 12 study in this school who are taught by teachers. This is not a charter school. The student teacher ratio of this school is 0.