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STS Response to COVID-19. Click this banner for Updates and Resources



STS Offices are closed to the general public due to the COVID-19 pandemic.
Office staff are on site and available Monday through Friday from 9am to 5pm.

For the safety of our office staff, we are conducting all meetings via virtual platforms.

Visitors who find it necessary to meet with office staff will be seen by appointment only.
ALL visitors will be required to undergo screening (including temperature check) and are required to wear a face mask.

If you do not agree with these regulations, you will not be permitted to enter our offices.
The safety and health of our staff is our top priority during this pandemic!

***Please mail all correspondence to P.O. Box 37, Media, PA 19063***

Thank you for your cooperation.
STS Management

Teachers & Para-professionals

Find out how you can join our staff as a substitute teacher or substitute para-professional! One interview can put you in touch with all of the school districts we service!

Become a Sub

School Districts

Find out how STS can help you reduce overhead costs, save time managing your substitute needs, recruiting, and interviewing.

Find Out How

Since contracting Substitute Teacher Service to supplement our AESOP, operations have improved from good to great.”

Vince Varner

Director of Secondary Education, Mifflin County School District

We renewed our contract with Substitute Teacher Service based on their ongoing superior services, resources and overall value. STS is flexible, working diligently with us to fill our vacancies and resolves issues.”

Sharon Standish

Director of Human Resources , Downingtown School District

Student Teacher Substitutes

Effective with the 2016-17 school year, PA Act 86 of June, 2016, will allow current students enrolled in a qualifying teacher preparation program, working toward Pennsylvania Certification, to work as a substitute teacher.

Become a Sub

Guest Teacher Program

This program is the first of its kind in Pennsylvania and is exclusive to STS. It allows those who have a 4 year degree to take an online training program that would prepare them for teaching in the classroom as a day to day substitute.

Learn How It Works