The Library/Instructional Materials Center houses the book collection and audio-visual materials for the school. Since McCarthy-Towne uses primary and secondary source material as instructional tools rather than text book series, the library is an integral part of the teaching environment. All items are catalogued, circulated, and maintained from this central location.

Primary grades are scheduled to visit the library once a week. While the upper grade students have a formal class time to visit the library, they also are encouraged to use the library when they have free time. The McCarthy-Towne Library/Instructional Materials Center Assistant is responsible for operating the center, training volunteers, and assisting students who visit the center.