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Substitute Teacher Service, Inc. is the foremost locator of substitute teachers, teacher aides, and support personnel in Pennsylvania. At STS, we supply our client school districts with the professional and support personnel they need, when they need them.

Our Mission

Substitute Teacher Service, Inc. is a customer service-based organization, dedicated to providing our clients with a workable, cost-effective solution to their substitute professional and support personnel needs; and to giving exposure to our employees in the many districts we service.

Company Profile

Substitute Teacher Service, Inc. is the largest employer and provider of substitute teachers and paraprofessionals in Pennsylvania. STS currently supplies personnel to over 80 school districts throughout the state.


STS recruits educational professionals from newly graduated teachers to certified retirees who serve as substitute teachers in the Pennsylvania school districts. Our recruiting efforts place over 7,000+ teaching professionals and paraprofessionals on our list at any given time.


STS fills over 2,500 jobs every day with teachers, paraprofessionals and support staff. Our numbers speak for themselves!


STS works in conjunction with the Department of Education to ensure that the professional staff we hire meet all of the requirements necessary for teaching and working in Pennsylvania school districts.


STS works with Intermediate Units to develop programs for our employees that help them meet state mandates, acquire training and other services they need in order to be successful.

Our Management Team

The management team of Substitute Teacher Service has over 120 combined years of experience in the temporary industry. Our expertise and recruiting practices in conjunction with employee retention gives us the competitive edge over other staffing agencies.

STS examined the way different school districts handle their need for substitute staffing. We know that if we apply the same principles of recruitment and retention, we can provide a workable, cost-effective solution in supplying school districts with certified/qualified professionals.

Our team consists of business executives, human resources specialists, certified teachers, school district administrators, certified technical experts and many talented professionals who bring the necessary skills to help STS achieve our mission and goals.

What We Do

STS conducts business in the greater Delaware Valley area from its headquarters in Aston, Pennsylvania, with branch offices in Lancaster and satellite recruiting offices throughout the state. Our service offices are open 5 days a week, Monday through Friday from 6:00 a.m. until 5:00 p.m.

STS is powered by Frontline Education, formerly Aesop.

We can help you! Contact us at 800-357-SUBS (7827)