Country Day's separate lower and middle/upper school libraries hold a vast wealth of resources in literature, research, audio/visual materials, and technological tools to help all students at every level learn the skills and the joys of exploring for knowledge.

The libraries contain over 50,000 volumes, more than 135 periodicals and newspapers as well as over 40 networked computers. Students of all ages enjoy unlimited checkouts of books with no overdue fines. The libraries' computer network provides students instant access to the world of reference material, including encyclopedias, dictionaries, indexes, atlases, almanacs, and periodical/newspaper databases.

The library program includes active author/illustrator visits to support reading at all ages as well as integrated lessons on reference skills at all levels.