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: info@greenwichlibrary.org


5 Sinawoy Road
Greenwich, CT 06807

2017 Children’s Summer Reading: Build a Better World

This year’s program runs from Monday, June 12 – Friday, August 11. Students in grades K-6 are eligible to sign up. Track your reading, earn prizes, and enjoy a summer of programs at the library! With a focus on architecture, children will have the chance to create, collaborate, and put their ideas to work in programs like a 3D printing program, an architecture series, and art collage workshop. There are also special events like STEAM magic, live theater, and drop-in crafts.

Print at Cos Cob Library

Print Here

Questions? Check out instructions here.


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

Adult Summer Reading Program

Come sign up, pick up a 3×5 index card with your borrowed book and when you return it, bring a 3-10 sentence review of what you’ve read for a chance to win a gift certificate to a local store.


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