Live Chat Support is available for homeschool customers only from 8:30 am – 6 pm EST.
Use our contact form to contact us.
Sales Team – Monday through Friday 8:30 am to 6:00 pm eastern
Phone: 888-854-6284 (MATH)
PO Box 8888
Lancaster, PA 17604
Mastery Educational Services – Monday through Friday 8 am to 8 pm eastern
Phone: 800-454-6284 (MATH)
Intervention and Special Education Departments should submit purchase orders to:
P.O. Box 8888
Lancaster, PA 17604
Fax or email is preferred for purchase orders.
If you're contacting us from outside of the United States, please review our International Distributors to find the authorized distributor nearest you.
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