How do I obtain a Library of Congress Control Number (LCCN)?

Learn more about the Library's Preassigned Control Number (PCN) program for publishers.

The Library's Preassigned Control Number (PCN) Program assigns Library of Congress Control Numbers (LCCNs), in advance of publication, to titles that may be added to library collections.

The publisher prints the LCCN in the book, which facilitates cataloging and other book processing activities. The PCN links the book to any record which the Library of Congress, other libraries, bibliographic utilities, or book vendors may create.

Last Updated: Jun 24, 2020
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