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| Location | Fax |
| AA&PG Branch Library | 202.633.8232 |
| Acquisitions | 202.633.4312 new! |
| Administrative Services Office | 202.633.4313 new! |
| Anacostia Branch Library | 202.610.3374 |
| CHNDM Branch Library | 212.849.8339 |
| Cullman Library of Natural History (Special Collections) | 202.633.0219 |
| Development Office | 202.633.4314 new! |
| Dibner Library of the History of Science & Technology | 202.633.9102 |
| Director's Office | 202.633.4315 new! |
| Freer Sackler Branch Library | 202.786.2936 |
| Hirshhorn Branch Library | 202.633.6764 |
| Interlibrary Loan Office | 202.633.4317 new! |
| MSC Branch Library | 301.238.3661 |
| Museum Studies & Reference Library | 202.786.2443 |
| NASM Branch Library | 202.786.2835 |
| NMAfA Branch Library | 202.357.4879 |
| NMAH Branch Library | 202.633.3427 |
| NMAI Branch Library | 301.238.3038 |
| NMNH Branch Library | 202.357.1896 |
| NPM Branch Library | 202.633.8876 |
| NZP Branch Library | 202.673.4900 |
| SERC Branch Library | 443.482.2286 |
| Shipping and Receiving Services | 202.633.4316 new! |
| SIL Research Annex | 202.357.1775 |
| STRI Branch Library | 507.212.8147 |