How do I get an ISBN for my book?

The Library of Congress does not administer or distribute International Standard Book Numbers (ISBNs).
For ISBN assistance, please contact Bowker, the U.S. ISBN Agency External , online or by phone at: (877) 310-7333.

For more information about the services the Library of Congress provides to the publishing community, such as: creating Cataloging in Publication (CIP) data; assigning Library of Congress Control Numbers (LCCNs) to books; assigning ISSNs to serial publications; and registering and depositing materials with the Copyright Office, please see the Library's Publishers page .

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Last Updated: Feb 15, 2023
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