Mercer County School District 404 welcomed 1,250 students in the 2024-25 school year, according to the Illinois State Board of Education.
This represents a 1.6% increase over the previous school year.
Mercer County High School had the largest enrollment in the district with 399 students.
Mercer County School District 404 roughly covers schools within Mercer County and has a main office in Aledo.
In 2022, Illinois had 1,925,415 students enrolled in a total of 3,977 schools. There were 130,467 teachers in the public schools, or roughly one teacher for every 15 students, compared to the national average of 1:16.
K-12 enrollment has been declining in Illinois for many years, reflecting demographic changes. Combined public and private K-12 enrollment dropped three percent between the 2019-2020 and 2020-2021 school year (60,900 students), far more than the typical 0.5 percent to 1.5 percent annual enrollment declines in Illinois over the last 5 years.
| School | Enrollment | Change from Previous Year (%) |
|---|---|---|
| Mercer County High School | 399 | 3.9% |
| Mercer County Junior High School | 268 | 0% |
| Apollo Elementary School | 359 | 5.3% |
| New Boston Elementary School | 160 | 0% |
Information in this article was obtained from the Illinois State Board of Education. The source data can be found here.



