The library's holdings now contain approximately 3.5 million volumes housed in seven university buildings across 11 separate collections.

It stores materials for undergraduate and graduate study in biology, chemistry, computer science, mathematics, and physics.

Dahlgren Memorial Library provides information and digital services and resources to support faculty, staff, and students of the Georgetown University Medical Center.

Its collection focuses on primary and secondary foreign sources, with materials from Australia, Canada, France, Germany, Great Britain, Ireland, Mexico, New Zealand, Scotland, and South Africa, and other nations.

Members may borrow books from other libraries in the system and they share off-site storage, among other initiatives.