Summary:
Zip code 61231 has one high school, Mercer County High School, serving grades 9–12 and 411 students. In 2025–2026, its proficiency rates were below the state rate in all nine reported subject-and-grade comparisons. Averaged across those results, the school was 10 percentage points below the state; the largest subject-average shortfall was in science, at 14 points.
The school’s strongest current result is grade 10 PreACT English Language Arts: 52% proficient, 2 points below the state’s 54%. Its weakest result by proficiency rate is grade 10 PreACT mathematics, at 26% versus 36% statewide, while its largest single gap is grade 9 PreACT science: 29% versus 47%, an 18-point difference. Across the three reported grades and exams, the school averaged 5 points below the state in ELA, 12 points below in mathematics, and 14 points below in science. There is no second high school in this list for a school-to-school comparison, so these standouts are within the school’s own results.
Overall, the school’s gap from the state widened between the two years of test data, although grade 10 ELA improved sharply: proficiency rose from 41% to 52%, and the school-state gap narrowed from 14 points to 2 points. Across the nine matched results, the average gap shifted from 9 points below the state in 2024–2025 to 10 points below in 2025–2026. SchoolDigger’s ranking fell from the 57th percentile in 2023–2024 to the 30th percentile in 2025–2026, and its star ratings were 3, 2, and 2; the ranking groups differed in size across years. Other indicators are mixed: 2025–2026 graduation was 89%, close to the state’s 90%, while chronic absenteeism was 38%, compared with 24% statewide. The school’s reported measure was 42% free/reduced lunch eligible in 2024–2025, and its student-teacher ratio was 13 in 2024–2025.
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