Mercer County High School, or MCHS, is a public four-year high school located at 1500 South College Avenue in Aledo, Illinois, a city in Mercer County, Illinois, in the Midwestern United States.
Serving 401 students in grades 9-12, Mercer County High School ranks in the bottom 50% of all schools in Illinois for overall test scores (math proficiency is bottom 50%, and reading proficiency is bottom 50%).
The percentage of students achieving proficiency in math is 15-19% (which is lower than the Illinois state average of 27%). The percentage of students achieving proficiency in reading/language arts is 20-24% (which is lower than the Illinois state average of 30%).
The student:teacher ratio of 13:1 is equal to the Illinois state level of 13:1.
Minority enrollment is 7% of the student body (majority Hispanic), which is lower than the Illinois state average of 55% (majority Hispanic).
Quick Stats (2025)
- Grades: 9-12
- Enrollment: 401 students
- Student:Teacher Ratio: 13:1
- Minority Enrollment: 7%
- Graduation Rate: 80-84% (Btm 50% in IL)
- Overall Testing Rank: Bottom 50%
- Math Proficiency: 15-19% (Btm 50%)
- Reading Proficiency: 20-24% (Btm 50%)
- Science Proficiency: 55-59% (Top 50%)
- Source: National Center for Education Statistics (NCES), IL Dept. of Education
School Overview
Mercer County High School's student population of 401 students has grown by 8% over five school years.
The teacher population of 31 teachers has grown by 10% over five school years.
Grades Offered
Grades 9-12
Total Students
401 students
Gender %
Total Classroom Teachers
31 teachers
Year Founded
2009
Colors
Gold, White
School Calendar
First Day of School
Sat. Aug 23, 2025
Last Day of School
Thu. May 21, 2026
School Motto
Ever to Conquer, never to yield
School Rankings
Mercer County High School ranks within the bottom 50% of all 3,542 schools in Illinois (based off of combined math and reading proficiency testing data).
The diversity score of Mercer County High School is 0.13, which is less than the diversity score at state average of 0.70. The school's diversity has stayed relatively flat over five school years.
Overall Testing Rank
#2046 out of 3542 schools
(Bottom 50%)
(Bottom 50%)
Math Test Scores (% Proficient)
15-19%
27%
Reading/Language Arts Test Scores (% Proficient)
20-24%
30%
Science Test Scores (% Proficient)
55-59%
50%
Student : Teacher Ratio
13:1
13:1
American Indian
n/a
1%
Asian
n/a
6%
Hispanic
4%
28%
Black
n/a
16%
White
93%
45%
Hawaiian
n/a
n/a
Two or more races
3%
4%
All Ethnic Groups
Graduation Rate
80-84%
87%
Eligible for Free Lunch
25%
43%
Eligible for Reduced Lunch
9%
4%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), IL Dept. of Education
Profile last updated: 02/09/2025
Frequently Asked Questions
What is Mercer County High School's ranking?
Mercer County High School is ranked #2046 out of 3,542 schools, which ranks it among the bottom 50% of public schools in Illinois.
What percent of students have achieved state testing proficiency in math and reading?
15-19% of students have achieved math proficiency (compared to the 27% IL state average), while 20-24% of students have achieved reading proficiency (compared to the 30% IL state average).
What is the graduation rate of Mercer County High School?
The graduation rate of Mercer County High School is 80-84%, which is lower than the Illinois state average of 87%.
How many students attend Mercer County High School?
401 students attend Mercer County High School.
What is the racial composition of the student body?
93% of Mercer County High School students are White, 4% of students are Hispanic, and 3% of students are Two or more races.
What is the student:teacher ratio of Mercer County High School?
Mercer County High School has a student ration of 13:1, which is equal to the Illinois state average of 13:1.
What grades does Mercer County High School offer ?
Mercer County High School offers enrollment in grades 9-12
What school district is Mercer County High School part of?
Mercer County High School is part of Mercer County School District 404.
School Reviews
3 8/5/2019
Quality of programs is not there. There are some really great teachers and some not good. The school is falling apart and the drive into the school is crazy, unsafe, disrepair, and totally disregarded by BOE and maintenance of building. Lawn is mowed! Parking lot becomes an ice rink and the back drive is a slide all winter if you can stay out of the car eating ruts! Overall school spirit is high and sports following is huge. Academics is bare minimum and the figures are showing students who would show high in any school and not from this district applications yearly!
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