About Cos Cob Library


The Cos Cob Library is the hub of the Cos Cob community. Choose from among 40,000 materials including books, movies, magazines, and CDs.

Wifi is available throughout and 12 public computers are available in the building. The Community Room displays art work throughout most of the year and the room is available for local meetings and programs. The Friends of Cos Cob Library support programs including several book clubs, numerous storytime and craft programs for children, author visits, 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


5 Sinawoy Road
Greenwich, CT 06807

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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, sponsoring programs and 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

Land Records: More than Metes the Eye

On Saturday, September 22 at 10:30 am, hear from genealogist Edwin W. Strickland II who will discuss land ownership from the right of the king through royal charters, grants and proprietor’s records to individual ownership. Learn More…


Library History

Discover the history of the Cos Cob Library and see how far the Library has come.

View History PDF



View beautiful photos of the Library and Library programs.

View Photos