- Enrollment
- 362
- Students per teacher
- 13.9:1
- Resource Index
- 34/100
High school (grades 9-12) · Aledo, IL
Mercer County High School
Federal NCES profile for Mercer County High School, including enrollment, faculty, free-lunch eligibility, demographics, and resource indicators - Resource Investment Index 29/100.
2024-25 NCES dataHigh school (grades 9-12)NCES 170139500018
👥 S:T ratio 43
🌟 Gifted program 30
🎓 Counselors 18
📋 Attendance 25
Scored 0–100 from federal NCES and CRDC indicators, resource allocation, not test scores. Full methodology →
The verdict
Mercer County High School earns 29/100 on the Resource Investment Index, with class sizes near the Illinois median. It is also less racially and ethnically mixed than most Illinois schools.
- #3 of 3
- public schools in Aledo · Resource Index
- 29
- Resource Index · Lower
- 14.2:1
- students per teacher
- 411
- students enrolled
Mercer County High School has class sizes near the Illinois median. Computed live against every Illinois school reporting to NCES.
By Resource Investment Index, Mercer County High School ranks #3 of 3 public schools in Aledo, IL.
School address
District: Mercer County School District 404 · Illinois
NCES ID 170139500018 Verify on NCES CCD record →
CCD year-over-year · 2022-23 → 2023-24
-3 students YoY
Mercer County High School held near 401 students from 2022-23 to 2023-24 (-3 headcount).
Teacher FTE added 29.0 → 30.9 across the same CCD years.
Source: NCES Common Core of Data public-school universe (2022-23, 2023-24).
Steady CCD campus
-3 students YoY 170139500018 · Aledo, IL High · SMALL · TRAD
411 enr · 14.2:1 · RII 29
Nearest enrollment peer: Apollo Elem School (362 students)
Mercer County High School held near 401 students from 2022-23 to 2023-24 (-3 headcount). Teacher FTE added 29.0 → 30.9 across the same CCD years. Read with this school → · District book → · Illinois schools → · Find another →
Mercer County High School in the enrollment neighbourhood
Fall enrollment among this campus and nearest district peers
- This school
Mercer County High School
411 students
- Apollo Elem Sc
Apollo Elem School
362 students
- Mercer County
Mercer County Jr High School
270 students
- New Boston Ele
New Boston Elem School
165 students
- Mercer County 66
Mercer County Elc
66 students
What this shows Mercer County High School reports 411 students on the CCD universe file.
How Mercer County High School compares
Mercer County High School held steady on CCD headcount: ratios and free-lunch share vs Illinois and U.S. means.
| Metric | This school | vs Illinois | Illinois avg | U.S. avg |
|---|---|---|---|---|
| Students per teacher | 14.2:1 | ▲ 1% | 14:1 | 15.7:1 |
| Enrollment | 411 | top 44% | - | - |
Source: NCES Common Core of Data School-level CCD + state/national means from Public School Universe · 2024-25
14.2:1
Leaner classes than 55% of US schools, a middle-of-the-pack class size.
411
Bigger than 49% of US schools by enrollment, mid-sized for the country.
Equity indicators methodology
Staffing depth
14.2:1
students per teacher
- 1% above state mean
Top 60% in Illinois - lower ratio than 40% of state schools
Close to the 15:1 benchmark most often cited for individualized attention.
Engagement
29.9%
chronically absent (missed 10%+ of school days)
At or above 20%, the commonly used threshold for "high" chronic absenteeism, signaling significant barriers to regular attendance.
Funding equity
$15,828
per pupil, district-wide
- below Illinois avg of $18,196
Somewhat below the U.S. average per-pupil spend; funding constraints may affect programs, facilities, and staffing.
Support staff
Counselors1.0 FTE
Per 411 students, the combined health-and-guidance staffing load for this school.
Discipline context
19
in-school suspensions + 8 out-of-school
Suspension rate: 4.6 per 100 students. Combined in-school and out-of-school rate: 6.6 per 100 students. Reported via the Civil Rights Data Collection.
Student demographics
White 92.9%
Two or More 3.2%
Hispanic or Latino 2.2%
African American 1.0%
Asian 0.5%
American Indian / Alaska Native 0.2%
Largest group: White at 92.9% of enrollment.
Student-body diversity index 13.5/100
Simpson diversity index - at 13.5, Mercer County High School is less mixed than the Illinois school average of 38.9.
Programs
AP courses offered 12
District finance for Mercer County School District 404 reports $15,828 per pupil (NCES F-33) - open the district page for the full revenue mix.
How Mercer County High School Compares to District-Mates
| School | Enrollment | Economic Profile | Student-Teacher Ratio |
|---|---|---|---|
| Apollo Elem School | Similar size | No free-lunch data | Similar S:T ratio |
| Mercer County Jr High School | Smaller | No free-lunch data | Lower S:T ratio |
| New Boston Elem School | Smaller | No free-lunch data | Lower S:T ratio |
| Mercer County Elc | Smaller | No free-lunch data | Higher S:T ratio |
Comparisons are relative to Mercer County High School's own figures; each column derives from NCES Common Core of Data.
Other Schools in This District
- Enrollment
- 270
- Students per teacher
- 11.7:1
- Resource Index
- 42/100
- Enrollment
- 165
- Students per teacher
- 8.3:1
- Resource Index
- 32/100
- Enrollment
- 66
- Students per teacher
- 22:1
- Resource Index
- 12/100
Nationwide high schools with similar size or staffing
Out-of-state peers matched by enrollment and by student-teacher ratio, not the same-city or same-district lists above.
Similar enrollment (~411 students)
Frequently asked questions about Mercer County High School
How many students attend Mercer County High School?
Mercer County High School has 411 students enrolled. It is a high school in Aledo, IL. CCD year-over-year: 404 (2022-23) → 401 (2023-24), nearly flat (-3).
What is the student-teacher ratio at Mercer County High School?
The student-teacher ratio at Mercer County High School is 14.2:1, which is 1% higher than the Illinois average of 14:1 and 10% lower than the national average of 15.7:1.
What is the racial and ethnic makeup of Mercer County High School?
The largest demographic group at Mercer County High School is White at 92.9% of enrollment, in Aledo, IL.
What is the Resource Investment Index for Mercer County High School?
Mercer County High School has a Resource Investment Index of 29/100 (lower reported resources relative to schools nationally) based on 4 factors: student-teacher ratio, gifted-program reporting, counselor availability, chronic absenteeism. Not a test-score or academic measure (national median ~41/100, see methodology).
How does Mercer County High School rank among public schools in Aledo?
By Resource Investment Index, Mercer County High School ranks #3 of 3 public schools in Aledo, IL. This compares federal resource and staffing data among local peers; it is not a test-score or academic ranking.
What other schools are in Mercer County School District 404?
Besides Mercer County High School, Mercer County School District 404 also operates Apollo Elem School (362 students), Mercer County Jr High School (270 students), and New Boston Elem School (165 students). See the Mercer County School District 404 district page for the complete list.