What does the student-to-teacher ratio tell me?

The student-to-teacher ratio is the number of students divided by the number of full-time equivalent (FTE) teachers. Lower ratios generally mean smaller class sizes and more individual attention, though the ratio does not directly equal class size since teachers have planning periods and may teach specialized subjects.

What types of staff are included?

School staff includes classroom teachers, special education teachers, instructional aides, counselors, administrators, librarians, nurses, social workers, psychologists, and support staff. The staffing breakdown shows how the district allocates its workforce across these roles.

Where does school staffing data come from?

Staffing data is reported annually by school districts to the state Board of Education as part of the School Report Card. It includes full-time equivalent counts, teacher qualifications, experience levels, and salary information.

Darien, IL School Staffing — Teacher Counts & Ratios

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Select Your District

Your assigned district depends on your home address within town.

School Staff — 2025i

NCES

Who teaches and supports students in your school districts. 926 teachers serve across all districts. The median household income here is $111K, providing context for local cost of living.

Teachersi

926

Student:Teacheri

17.3:1

Avg Teacher Salaryi

$111K

Local Median Incomei

$111K

By District

CHSD 99High School District · 4,598 students

This district employs 351 teachers with an average salary of $119K. 94.5% returned from the prior year.

Staff Breakdowni

422 total FTE

326 Teachers (77%)

20 Counselors (5%)

16 Social Workers (4%)

6 Psychologists (1%)

2 Nurses (0%)

52 Admin (12%)

Teachers

Headcount

351

325.8 FTE

Student:Teacher

19:1

Avg Salary

$119K

17.6 yrs avg experience

Retention ratei94.5%

Attendance ratei94.5%

Administration

Avg Salary

$159K

Student:Admin

89:1

Principal Turnover

in past 6 years

Support Staff

Counselorsi

1 per 230 students

Nursesi

1 per 2299 students

Psychologistsi

1 per 766 students

Social Workersi

1 per 287 students

Teacher Credentials

Novice teachersi2%

Out-of-fieldi4.8%

Provisional licensei0.6%

Hinsdale Twp HSD 86High School District · 3,801 students

This district employs 315 teachers with an average salary of $127K. 95.9% returned from the prior year.

Staff Breakdowni

380 total FTE

294 Teachers (77%)

18 Counselors (5%)

15 Social Workers (4%)

7 Psychologists (2%)

2 Nurses (1%)

44 Admin (12%)

Teachers

Headcount

315

294 FTE

Student:Teacher

17:1

Avg Salary

$127K

18.8 yrs avg experience

Retention ratei95.9%

Attendance ratei95.9%

Administration

Avg Salary

$150K

Student:Admin

87:1

Principal Turnover

in past 6 years

Support Staff

Counselorsi

17.7

1 per 215 students

Nursesi

1 per 1901 students

Psychologistsi

1 per 543 students

Social Workersi

1 per 253 students

Teacher Credentials

Novice teachersi1.5%

Out-of-fieldi4.4%

Provisional licensei1.1%

Darien SD 61Elementary District · 1,232 students

This district employs 118 teachers with an average salary of $76K. 87.8% returned from the prior year.

Staff Breakdowni

135 total FTE

115 Teachers (85%)

2 Counselors (1%)

4 Social Workers (3%)

3 Psychologists (2%)

3 Nurses (2%)

9 Admin (7%)

Teachers

Headcount

118

114.8 FTE

Student:Teacher

14:1

Avg Salary

$76K

14.4 yrs avg experience

Retention ratei87.8%

Attendance ratei87.8%

Administration

Avg Salary

$125K

Student:Admin

137:1

Principal Turnover

in past 6 years

Support Staff

Counselorsi

1 per 616 students

Nursesi

2.5

1 per 493 students

Psychologistsi

1 per 411 students

Social Workersi

1 per 308 students

Teacher Credentials

Novice teachersi8.7%

Out-of-fieldi5.3%

Provisional licensei1.7%

Center Cass SD 66Elementary District · 1,119 students

This district employs 77 teachers with an average salary of $86K. 87.4% returned from the prior year.

Staff Breakdowni

89 total FTE

76 Teachers (85%)

1 Counselors (1%)

4 Social Workers (4%)

2 Psychologists (2%)

1 Nurses (1%)

6 Admin (7%)

Teachers

Headcount

75.9 FTE

Student:Teacher

17:1

Avg Salary

$86K

15 yrs avg experience

Retention ratei87.4%

Attendance ratei87.4%

Administration

Avg Salary

$143K

Student:Admin

179:1

Principal Turnover

in past 6 years

Support Staff

Counselorsi

1 per 1119 students

Nursesi

0.5

1 per 2238 students

Psychologistsi

1 per 560 students

Social Workersi

1 per 280 students

Teacher Credentials

Novice teachersi7.9%

Out-of-fieldi4.3%

Provisional licensei1.3%

Cass SD 63Elementary District · 759 students

This district employs 65 teachers with an average salary of $80K. 93% returned from the prior year.

Staff Breakdowni

74 total FTE

64 Teachers (86%)

2 Counselors (3%)

1 Social Workers (1%)

1 Psychologists (1%)

6 Admin (8%)

Teachers

Headcount

63.7 FTE

Student:Teacher

14:1

Avg Salary

$80K

13 yrs avg experience

Retention ratei93%

Attendance ratei93%

Administration

Avg Salary

$136K

Student:Admin

138:1

Principal Turnover

in past 6 years

Support Staff

Counselorsi

1 per 380 students

Psychologistsi

1 per 759 students

Social Workersi

1.1

1 per 690 students

Teacher Credentials

Novice teachersi7.6%

Out-of-fieldi3.7%

Provisional licensei3.1%

Darien, IL School Staffing — Teacher Counts & Ratios