Commonwealth Catalog

The Commonwealth Catalog extends your search beyond the C/W MARS library network. Search through millions of items at participating libraries across Massachusetts. Requests will be delivered to your local library for pickup.

Please search the C/W Mars online catalog first. If the material you want is not available, you can request it via the Commonwealth Catalog. 

Log in below to place, manage, and cancel requests in the statewide Commonwealth Catalog.

    Enter your library card number.

    Enter your PIN or your password. This is the same PIN or password you use to log into your C/W MARS library account. If you have never logged into your C/W MARS library account before, please enter the last four digits of your telephone number. Example: 0926

Need Help? Visit the Commonwealth Catalog FAQ or contact your local library for assistance.