The County Library is organized into service departments, under these supervisors:
| Department | Name | Phone Number |
|---|---|---|
| Director | Susan Calantone | 973-285-6934 |
| Assistant Director | Darren O'Neill | 973-285-6934 |
| Chief Librarian and Head of Reference\Music & Media\ILL\Periodicals | Mary Sanders | 973-285-6969 |
| Readers' Services | Mark Anderson | 973-285-6970 |
| Children's Services | Princess Thomas | 973-285-6980 |
| Circulation | Laurence Ross | 973-285-6930 |
| Technical Services | Vidya Manohar | 973-285-6955 |
| Personnel | Heidi Peer | 973-285-6947 |