Summary:
ZIP code 60045 has one high school, Lake Forest High School, serving grades 9–12 and enrolling 1,359 students. For families considering high school in the area, the clearest finding is that Lake Forest’s 2025–2026 proficiency results were above Illinois results in every reported subject and grade, with its largest advantage in grade 11 ACT mathematics.
Because it is the only school listed, Lake Forest is both the top and bottom school in the ZIP code by default; there is no local school-to-school comparison. Against the state, its smallest lead was 28 points in grade 9 PreACT ELA, while its largest was 45 points in grade 11 ACT mathematics. Across grade and exam results, the school’s average state advantage was greatest in mathematics at 42 points, compared with 35 in science and 34 in ELA. Its average proficiency was highest in ELA, at 89%, showing that the school’s highest scores and its largest advantage over the state are in different subjects. Graduation was 99%, versus 90% statewide, and chronic absenteeism was 10%, versus 24% statewide.
Results improved on the grade 11 ACT from 2024–2025 to 2025–2026: school proficiency rose by 6 points in ELA, 7 in mathematics and 4 in science. PreACT changes were mixed: grade 10 ELA and science fell by 5 and 4 points, while grade 9 mathematics rose by 6 points. Across all nine matched results, the average school–state gap widened by 2 points. SchoolDigger gives Lake Forest CHSD 115 five stars and ranks it 10th of 738 Illinois districts; its school ranking was 13th of 620 in 2025–2026. The student-teacher ratio was 10.3 in 2024–2025. As context, 5% of students were reported as free/reduced lunch eligible in 2021–2022, an earlier year than the test results.
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