What's the difference between an ISBN and an LCCN?
An ISBN identifies a specific edition and format of a book for sale. An LCCN identifies the Library of Congress catalog record for a book, which libraries use to catalog it. We don't provide LCCNs at this time.
| ISBN | LCCN | |
|---|---|---|
| Full name | International Standard Book Number | Library of Congress Control Number |
| Issued by | National ISBN agencies, such as Bowker in the United States | The Library of Congress |
| Identifies | A specific edition and format of a book | The Library of Congress catalog record for the book |
| Used by | Retailers, distributors and libraries | Libraries, for cataloging |
| Available from ISBNdirect | Yes | Not at this time |
Getting an LCCN
LCCNs come from the Library of Congress. It assigns them to books before publication through its Preassigned Control Number (PCN) program. Check the program's eligibility rules before you apply.
An LCCN is optional. You don't need one to publish or sell your book, and it doesn't replace an ISBN.
To get an ISBN, see How do I get an ISBN?.