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While the library building is closed until further notice, the Library's online services and resources continue to be available to Northwestern students, faculty, and staff.

Please see this Guide to Modified Services for more information.

Dewey Decimal Classification to Library of Congress Classification

Mapping Dewey numbers to corresponding LC numbers

What's in this guide

What do you do if you have a Dewey Decimal Classification (DDC) number, but you are looking for books in the Library of Congress Classification (LCC) scheme?  See the following pages in this guide for help.


  • DDC to LCC - Mapping Dewey Decimal numbers to corresponding Library of Congress numbers
  • LCC to DDC - Mapping Library of Congress Classification numbers to corresponding Dewey numbers.

Dewey Decimal Classification handout and Library of Congress classification handout

Dewey Decimal list (linked below) - The basic categories of the Dewey Decimal Classification scheme.

Library of Congress list (linked below) - The basic categories of the Library of Congress Classification scheme.