Support Center

Customer Service

Prior to contacting Riverside, please look through the list of resources below. We may already have the answer that you are looking for on our website. If you are unable to find the answer to your question please use this email form.

Order Forms

Contact Options

Corporate Address:
Houghton Mifflin Harcourt - Riverside
3800 Golf Road, Suite 200
Rolling Meadows, IL 60008
Phone Numbers:
General: 800.323.9540
Outside US: 630.467.7000
Fax: 630.467.7192

Email Addresses:
Customer Service:
Software Support:
Software Support:
Online Support Service
General: 800.323.9540
Outside US: 630.467.7000
Office Hours: 8:00am - 6:00pm (CST) M-F
*IMPORTANT NOTE FOR CREDIT CARD USERS: For your security, we can only accept credit card orders through our secure website or by phone at 800.323.9540. Please do not send your credit card information in an email.