If you’re self-publishing a book, you’ve probably discovered that printing a great-looking book is only part of the process. There’s a whole behind-the-scenes world of publishing details—ISBNs, barcodes, copyright pages—and one question that occasionally comes up is whether you need a Library of Congress Control Number (LCCN).
For most self-published authors an LCCN is not really necessary unless you think a large number of libraries or school systems will want to acquire your book. But let’s break in down so you can decide for yourself if an LCCN is right for your book.
What Is an LCCN?
An LCCN (Library of Congress Control Number) is a unique identification number assigned by the Library of Congress to a book’s bibliographic record. Librarians use it to quickly catalog and reference books within library systems.
A few important things to know right away:
- An LCCN is not a copyright registration
- It does not provide copyright protection for your content
- It does not replace an ISBN
Think of it as a cataloging tool that makes your book easier for libraries to organize and discover.
What Is a PCN (Preassigned Control Number)?
A PCN is simply an LCCN that’s assigned before your book is published.
Since most books aren’t printed yet when authors apply, the Library of Congress runs the Preassigned Control Number Program. This allows publishers—including self-published authors—to receive an LCCN in advance, place it inside the book, and then send a finished copy to the Library of Congress after printing.
In short:
- PCN = the application process and pre-publication assignment
- LCCN = the actual control number used by libraries
If you’re self-publishing, you’ll almost always be applying for a PCN.
Do You Actually Need an LCCN?
For most self-published authors, an LCCN is an uneccessary additional step.
You do not need an LCCN to:
- Sell your book on Amazon or other online retailers
- Distribute through bookstores
- Register your copyright
- Purchase an ISBN
However, if libraries, schools, or educators are part of your target audience, having an LCCN can make a difference.
Advantages of Having a PCN or LCCN
While optional, there are some solid reasons many self-published authors choose to apply.
1. Easier Library Cataloging
Libraries rely on standardized metadata. A book with an LCCN is faster and easier for librarians to catalog, which lowers the barrier to adding your book to their collection.
2. A More Professional, Traditional Look
Including an LCCN on your copyright page signals that your book follows traditional publishing standards. It’s a small detail, but one librarians and educators may notice—especially for self-published titles.
3. Better Discoverability in Library Systems
An LCCN helps your book appear accurately in library databases, which is particularly important for children’s books, nonfiction, and educational titles.
4. It’s Free
The PCN program is free for eligible U.S.-based publishers, including self-published authors. The only requirement is sending a finished copy of the book to the Library of Congress after publication.
How to Apply for a PCN (Step by Step)
Applying for a PCN is simpler than most authors expect:
- Finish your title details
You’ll need your final title, subtitle, author name, format (hardcover, softcover, board book, etc.), and estimated publication date. - Apply through the Library of Congress PCN Program
Applications are submitted online through the Library of Congress website. - Receive your PCN (LCCN)
Once approved, you’ll receive your control number—usually within a few days. - Add the LCCN to your copyright page
This must be done before printing. - Send a copy after printing
After your book is printed, you’ll mail one copy to the Library of Congress so they can complete the catalog record.
Does having a PCN guarantee the Library of Congress will catalog my book?
No. Receiving a PCN (and LCCN) does not guarantee that the Library of Congress will fully catalog your book or add it to its permanent collection. The PCN program allows you to include a control number in advance, but the Library of Congress ultimately decides whether to create a full catalog record after reviewing the copy you submit. That said, submitting your finished book is still required, and having a PCN ensures your book can be accurately identified and evaluated.
How to Add your PCN to your Book
Your LCCN should appear on the copyright page, typically on the back of the title page.
A common format looks like this:
Library of Congress Control Number: 2025XXXXXX
Placement tips:
- Keep it near your ISBN and copyright notice
- Do not place it on the cover
- Use the exact wording provided by the Library of Congress
FAQ: LCCNs for Self-Published Authors
Is an LCCN the same as copyright registration?
No. Copyright registration is handled by the U.S. Copyright Office and protects your intellectual property. An LCCN is strictly for library cataloging.
Can I apply if I’m self-publishing?
Yes. Self-published authors in the United States are eligible for the PCN program.
Will having an LCCN guarantee libraries buy my book?
No—but it may remove a friction point and make your book easier for libraries to consider and catalog.
Final Thoughts
At PufferPrint, we’re big believers that the little details matter—especially for authors who want their books taken seriously by libraries and schools. A Library of Congress Control Number isn’t required, but it’s a smart, low-effort step if institutional sales are part of your long-term plan.
If you’re already investing in professional printing, an LCCN is one more way to help your book stand shoulder-to-shoulder with traditionally published titles.