Enrollment
172
High
DISTRICT 160 · STATE 834
SCHOOL COMMUNITY·ILLINI CENTRAL CUSD 189·NCES 170011305387
Illini Central High School
208 N West Ave, Mason City, IL 62664 · (217) 482-5180 · Mason County
GRADES 09–12HIGH42-RURALREGULAR SCHOOL172 STUDENTS
D
allk12 Grade
Scored higher than 13% of Illinois public high schools
- CTest scores Share of students meeting the state standard in reading, math, and other tested subjects, 2023-24 and 2024-25.
- FBeats expectations How far test scores land above or below what the share of low-income students predicts for a school in this state.
- ·Three-year trend Not available for this school, so the grade uses the other parts.
Grades compare a school only with schools in the same state, because every state gives its own test. How grades work · Top-graded Illinois public high schools
Student : Teacher
8.2:1
21 FTE teachers
DISTRICT 12.8:1 · STATE 13.8:1
Free / Reduced Lunch
38%
66 students
DISTRICT 47% · STATE 56%
Community
0
0 members
Enrollment and student:teacher ratio compared against other high schools. Free/Reduced Lunch and demographics compared against all schools.
Enrollment by grade, 2024-25
| Grade | Students | Share |
|---|---|---|
| Grade 9 | 46 | 27% |
| Grade 10 | 43 | 25% |
| Grade 11 | 43 | 25% |
| Grade 12 | 40 | 23% |
Student demographics
8%Diversity index
The chance that two students picked at random belong to different racial or ethnic groups.
DISTRICT 11% · STATE 69% · US 70%
Student head counts by race/ethnicity from federal NCES enrollment data. District, state, and US figures are each group's share of all public school students in that area (US excludes territories). Very small groups may be suppressed in the source, so categories do not always sum exactly to total enrollment.
Gender split
School pathway
Feeds from
Based on grade levels within Illini Central CUSD 189. Attendance zones can vary; confirm enrollment with the district.
BeatsExpectations
Demographically-adjusted score · methodologyTier
UNDERPERFORMING
Bottom 10% of IL schools after controlling for student poverty
Actual proficiency
26.1%
composite math + reading, all grades
Predicted
49.4%
based on IL schools with similar FRL share
Beats by
-23.2pp
below demographic expectation
What this means: About 26% of students here test proficient in math and reading, below the roughly 49% typical for Illinois schools with a similar share of low-income students. BeatsExpectations compares each school with others at the same poverty level, not by raw scores, so a school lands here when its results trail those comparable schools, which is not the same as having low scores. A higher-scoring school can still fall in this tier if similar schools score higher still.
BeatsExpectations runs a per-state regression of proficiency on free/reduced-lunch share, then scores each school by residual. How this is calculated →
Schools most like Illini Central High School
Illini Central High School's state test result (26.1% proficient) is higher than 0 of the 5 schools below with a result.
| School | Students | Low-income | Proficient |
|---|---|---|---|
| Illini Central High School this school | 172 | 38.4% | 26.1% |
| Winchester High School Winchester | 166 | 38.6% | 39.3% |
| Crab Orchard High School Marion | 154 | 39.0% | 33.3% |
| Carrollton High School Carrollton | 180 | 39.4% | 35.3% |
| Unity High School Mendon | 176 | 39.8% | 38.5% |
| Stewardson-Strasburg High School Strasburg | 143 | 36.4% | 49.0% |
Matched among Illinois high schools on enrollment, the share of students from low-income families (eligible for free or reduced-price lunch), and racial and ethnic makeup. Proficient is the average share of students meeting the state standard across all of the school's state tests in 2023-24 and 2024-25, the same combined score our test-score rankings use. Online schools and schools serving specialized populations are not matched.
Where Illini Central High School ranks
Among high schools| Measure | This school | In Illinois |
|---|---|---|
| State test proficiency ranked highest first | 26.1% | #401 of 573 |
| Enrollment ranked largest first | 172 | #571 of 708 |
| Free and reduced lunch ranked highest share first | 38.4% | #424 of 578 |
Ranked against other public high schools. Online schools are left out of every list, and test-score lists leave out schools that serve specialized populations. Each rank links to the full list. Arrows under a test-score rank show places moved since the prior test year, among schools tested both years.
4-year change
SY 2020-21 vs SY 2024-25Enrollment
172
-21 (-11%) vs 2020
-37% since 1990-91, when it was 273
Source: NCES Common Core of Data
Enrollment and staffing by year
| School year | Students | Teachers (FTE) | Students per teacher | Free and reduced lunch |
|---|---|---|---|---|
| 2024-25 | 172 | 21 | 8.2:1 | 38% (66) |
| 2023-24 | 190 | 20.1 | 9.4:1 | 38% (73) |
| 2022-23 | 185 | 19.9 | 9.3:1 | 43% (80) |
| 2020-21 | 193 | N/A | N/A | N/A |
| 2017-18 | 193 | 19.4 | 9.9:1 | 46% (88) |
| 2015-16 | 238 | 22 | 10.8:1 | 45% (108) |
| 2010-11 | 267 | 20 | 13.3:1 | 34% (91) |
| 2000-01 | 309 | 22 | 14.1:1 | N/A |
| 1990-91 | 273 | 24 | 11.4:1 | N/A |
Source: NCES Common Core of Data. Rows are the federal collections on file for Illini Central High School.
Since 2017-18: students down 11% (193 to 172); teachers up 8% (19.4 to 21).
About Illini Central High School
Families in Mason City, Illinois, are served by Illini Central High School, a small high school. The latest federal count shows 172 students in grades 9 through 12. Against the 834-student average for high schools in Illinois, enrollment here is 79% lower.
Within Illini Central CUSD 189, Illini Central High School is one of 4 schools. The district enrolls 640 students.
White students are the large majority at Illini Central High School, with 96% of enrollment. Other groups make up 2% multiracial. The county population is about 95% White, within a few points of the school. By the diversity index, Illini Central High School comes in at 8%.
Illini Central High School employs 21 full-time-equivalent teachers. That gives a ratio of about 8.2:1. The average ratio among high schools in Illinois is 13.8:1, higher than at this school. Illini Central High School's free or reduced-price lunch eligibility rate is 38%. The rate at public schools in Mason County averages 51%, higher than here.
The allk12 Grade for Illini Central High School is D. Compared with Illinois public high schools, the school scored higher than 13% on a mix of test scores, poverty-adjusted results, and recent trend.
Compared with Illinois schools that have similar shares of low-income students, Illini Central High School scores 23.2 points lower than predicted. Its average proficiency rate on state tests is 26.1%; the prediction is 49.4%.
Census Bureau estimates for Mason County show that median household income is about $62,845, roughly 17% of adults have a four-year degree or more, and about 11% of residents live below the federal poverty line. Illini Central High School is one of 9 public schools in Mason County, which together enroll about 2,124 students.
The next-closest public school is Illini Central Grade School, less than a tenth of a mile away. Counting only straight-line distance, 3 other public schools are within five miles. Of 8 schools in the immediate area with test results, Illini Central High School ranks 8th on average proficiency.
Its NCES locale code is Rural: Distant: the school is in rural territory some distance from an urban area.
The student count in 2024-25 was 172, 11% below the 193 of 2020-21.
Conversations here can range across sports schedules, lunch menus, and spirit week. Reviews and ratings from people who know the school are welcome.
Mason County at a glance
View full county profilePopulation
12,745
Census ACS
Median income
$62,845
Household, ACS
Bachelor's+
17%
Adults 25+
Poverty rate
11%
Below federal line
Schools in county
9
2,124 students
Quick facts
Related schools
Other schools in Illini Central CUSD 189
- Illini Central Grade SchoolElementary · 264 students
- Illini Central Middle SchoolMiddle · 139 students
- West Campus FacilityElementary · 65 students
Other schools in Mason City
- Illini Central Grade SchoolElementary · 264 students
- Illini Central Middle SchoolMiddle · 139 students
- West Campus FacilityElementary · 65 students
Nearby schools
- Illini Central Grade School0.0 mi · 264
- Illini Central Middle School0.0 mi · 139
- West Campus Facility0.6 mi · 65
- Greenview Jr/Sr High School8.7 mi · 107
- Greenview Elementary School8.7 mi · 117
- New Holland-Middletown Elementary School9.7 mi · 70
Frequently asked questions
About Illini Central High SchoolHow many students attend Illini Central High School?
Illini Central High School enrolls approximately 172 students in grades 09-12.
What age range does Illini Central High School serve?
Illini Central High School serves students from grade 09 through grade 12.
What is the student-teacher ratio at Illini Central High School?
The student-to-teacher ratio at Illini Central High School is approximately 8.2:1 (21 FTE teachers).
What is the racial breakdown of students at Illini Central High School?
At Illini Central High School, the student body is approximately 96% White, 2% Hispanic, 2% Two or more.
What district is Illini Central High School in?
Illini Central High School is part of Illini Central CUSD 189.
Data sourceSchool profile facts are sourced from the NCES. Community content is posted by allk12 members.