Getting your book into libraries can be another way for it to be discovered by readers although it does not directly increase sales. Here is a collection of links to library directories and lists.

ALA Lists of Libraries
This resource provides by the ALA contains links to resources that provide library email lists, library directories and more.

American Library Directory
This annual guide contains profiles for over 36,000 public, academic, special, and government libraries and library-related organizations in the U.S. and Canada

Find Your Library
This resource from the Institute of Museum and Library Services lets you search data from the FY 2015 Public Libraries Survey on over 9,000 public library systems and over 17,000 public library outlets.

Libraries.org Library Directory
Libraries.org is a searchable directory of libraries located through the world.

LibrarySpot
LibrarySpot is a reference site that includes links to libraries organized by category.

LibWeb
LibWeb provides lists of websites for libraries in the U.S. and around the world. The lists include links to library websites by U.S. state.

List of Largest U.S. Libraries
Wikipedia maintains a list of the 25 biggest public libraries, measured by the size of their collection.

Number of Libraries in U.S.
This page provided by the ALA provides a count of the number of libraries in the U.S. by type. There are over 118,000 libraries.

State Library Websites List
You can quickly find links to state library agency websites on this webpage. It includes a clickable map.

WorldCat
WorldCat is a search tool designed to help you find items available in libraries near you. It includes information from over 10,000 libraries worldwide.