The Pennsylvania Department of Revenue and the Pennsylvania Higher Education Assistance Agency provide school codes for Pennsylvania. The IRS uses school district codes in establishing residency and to calculate tax liability. PHEAA and student financial aid organizations use the codes in determining financial aid.
Students can find testing sites for taking the Scholastic Aptitude Test and other exams on The College Board's website. Colleges and universities require school codes on their admissions applications. Many schools have the same name or similar names, so the codes indicate which high school an applicant attended. School codes exist for public and private elementary, middle and high schools. Colleges and universities also have school codes.