About Cos Cob Library


The Cos Cob Library is the hub of the Cos Cob community. We welcome you to choose from among approximately 40,000 items including books, movies, magazines, and CDs.

Wifi is available throughout the building and we offer 12 public computers. A Community room displays art work throughout most of the year and the room is available for local meetings and programs. Supported by the Friends of Cos Cob Library, we offer several book clubs, numerous story times and craft programs for children, author visits and informative lectures for adults, and much more.

It has often been stated that our library resembles CHEERS, where everybody knows your name.  Visit and see for yourself!

Hours & Directions


Mon | 12 pm – 8 pm
Tues – Sat | 9 am – 5 pm
Sun | Closed


Phone: (203) 622-6883
Email us: info@greenwichlibrary.org


5 Sinawoy Road
Greenwich, CT 06807


The Friends of Cos Cob Library

The Friends of the Cos Cob Library is a volunteer organization dedicated to encouraging and assisting the work of the Cos Cob Branch of the Greenwich Library by providing information to the community, by sponsoring programs and by coordinating the volunteer activities of the Cos Cob Library.

Learn More


Catch up on all things Cos Cob with our annual newsletter, The Hubcap, created by the Friends of the Cos Cob Library. Information includes upcoming programs and events.

View Newsletter

Ongoing Programs

Cos Cob is excited to offer both book groups and
other programs on an ongoing basis.

Special Events

History of the 50’s and 60’s Through Popular Songs, with Marc Black

Enjoy songs by artists ranging from Dean Martin to George Harrison as Marc Black visits the Library for a musical history lesson on Thursday, January 26th at 2:00 pm.


Library History

Discover the history of the Cos Cob library. See how far the library has come.

View History PDF



View beautiful photos of the library and library programs.

View Photos