Mercer County High School

Mercer County High School, a tight-knit four-year high school in Aledo, Illinois, operated by Mercer County School District 404, teaches 411 students, covering grades 9 through 12. Enrollment runs roughly 51% leaner than the state mean of about 834.

Mercer County School District 404 runs 5 schools in total, collectively educating 1,274 students. Mercer County High School is one of those campuses.

On demographics, Mercer County High School records that nearly all students (93%) are White. The remainder looks like 3% multiracial, 2% Hispanic. That mix tracks the wider county fairly closely.

On the resource side, On paper, Mercer County High School has 32 full-time-equivalent teachers, translating to a class-load average of around 13.1:1. That figure is tighter than the state norm's 13.8:1 average. Roughly 42% of students at Mercer County High School qualify for free or reduced-price lunch, a commonly cited indicator of low-income enrollment.

With demographic context factored in, Mercer County High School sits in the middle band of the BeatsExpectations distribution. Schools with this campus's student mix typically land near 47.5%; this one delivers 38.0%.

In the broader community, community-level numbers for Mercer County indicate median household income runs about $74,182, roughly 21% of adults have completed at least a four-year degree, and the poverty rate sits near 7%. Across Mercer County's 8 public schools (combined enrollment of about 1,941 students), Mercer County High School is one campus in the mix.

Nearest neighbor: Apollo Elem School, around 0.6 miles off. Counting just inside five miles, 2 other public schools cluster around Mercer County High School. Among the 8 schools in that immediate cluster with test data (this one included), Mercer County High School ranks 7th on composite proficiency, beneath the local average of 42.2%.

The campus sits in a low-density setting.

Trend over the last 7 years. Over the past 7-year window, the student count increased 4%: 396 students in 2018 compared to 411 in 2025. Class-load math has narrowed: from 14.2:1 in 2018 to 13.1:1 in 2025.

On allk12, the feed for Mercer County High School typically covers sports schedules, lunch menu changes, and school spirit week. Contributors range from current parents to recent graduates and teachers.