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.

Deerfield, 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. The median household income here is $182K, providing context for local cost of living.

Student:Teacheri

14.5:1

Avg Teacher Salaryi

$110K

Local Median Incomei

$182K

By District

Glenbrook HSD 225High School District · 4,975 students

Teachers earn an average of $128K. 94.5% returned from the prior year.

Staff Breakdowni

418 total FTE

394 Teachers (94%)

25 Counselors (6%)

Teachers

Student:Teacher

15:1

Avg Salary

$128K

16.7 yrs avg experience

Retention ratei94.5%

Attendance ratei94.5%

Administration

Avg Salary

$186K

Support Staff

Counselorsi

24.5

1 per 203 students

Teacher Credentials

Novice teachersi2%

Out-of-fieldi8%

Provisional licensei0.5%

North Shore SD 112Elementary District · 3,695 students

Teachers earn an average of $89K. 90.7% returned from the prior year.

Teachers

Student:Teacher

16:1

Avg Salary

$89K

14.2 yrs avg experience

Retention ratei90.7%

Attendance ratei90.7%

Administration

Avg Salary

$150K

Teacher Credentials

Novice teachersi5%

Provisional licensei2.4%

Twp HSD 113High School District · 3,000 students

Teachers earn an average of $138K. 93.5% returned from the prior year.

Staff Breakdowni

281 total FTE

263 Teachers (94%)

18 Counselors (6%)

Teachers

Student:Teacher

14:1

Avg Salary

$138K

18.3 yrs avg experience

Retention ratei93.5%

Attendance ratei93.5%

Administration

Avg Salary

$185K

Support Staff

Counselorsi

1 per 167 students

Teacher Credentials

Novice teachersi1.1%

Out-of-fieldi0.8%

Provisional licensei0.8%

Deerfield SD 109Elementary District · 2,709 students

Teachers earn an average of $87K. 90.2% returned from the prior year.

Staff Breakdowni

261 total FTE

253 Teachers (97%)

8 Counselors (3%)

Teachers

Student:Teacher

14:1

Avg Salary

$87K

13.5 yrs avg experience

Retention ratei90.2%

Attendance ratei90.2%

Administration

Avg Salary

$147K

Support Staff

Counselorsi

1 per 339 students

Teacher Credentials

Novice teachersi4.3%

Provisional licensei0.4%

Northbrook SD 28Elementary District · 1,817 students

Teachers earn an average of $98K. 94.3% returned from the prior year.

Teachers

Student:Teacher

13:1

Avg Salary

$98K

16.2 yrs avg experience

Retention ratei94.3%

Attendance ratei94.3%

Administration

Avg Salary

$159K

Teacher Credentials

Novice teachersi0.5%

Out-of-fieldi0.6%

Provisional licensei0.5%

Northbrook ESD 27Elementary District · 1,311 students

Teachers earn an average of $105K. 94.9% returned from the prior year.

Staff Breakdowni

120 total FTE

119 Teachers (99%)

1 Counselors (1%)

Teachers

Student:Teacher

13:1

Avg Salary

$105K

15.8 yrs avg experience

Retention ratei94.9%

Attendance ratei94.9%

Administration

Avg Salary

$164K

Support Staff

Counselorsi

1 per 1311 students

Teacher Credentials

Novice teachersi0.8%

Out-of-fieldi1.2%

Deerfield, IL School Staffing — Teacher Counts & Ratios