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 411 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 and Black), which is lower than the Illinois state average of 55% (majority Hispanic).
Quick Facts (2026)
- Grades: 9-12
- Enrollment: 411 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 411 students has grown by 5% over five school years.
The teacher population of 32 teachers has grown by 14% over five school years.
Grades Offered
Grades 9-12
Total Students
411 students
Total Classroom Teachers
32 teachers
Year Founded
2009
Colors
Gold, White
School Calendar
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 0.69. 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
n/a
Asian
1%
6%
Hispanic
2%
29%
Black
1%
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
24%
43%
Eligible for Reduced Lunch
9%
4%
School Statewide Testing
School District Name
Source: National Center for Education Statistics (NCES), IL Dept. of Education
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?
411 students attend Mercer County High School.
What is the racial composition of the student body?
93% of Mercer County High School students are White, 3% of students are Two or more races, 2% of students are Hispanic, 1% of students are Asian, and 1% of students are Black.
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.
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