The Commonwealth Catalog, also known as "ComCat", is now back in service after being suspended in March due to COVID-19. With access to millions of titles, the Commonwealth Catalog extends your library’s reach to all participating libraries throughout Massachusetts, with convenient pick-up at your local library.
To request books and other material, login at commonwealthcatalog.org using your CLAMS Card number and PIN.
What you should know about the Commonwealth Catalog:
Start local
Libraries share items across the state, but it’s always faster and more cost effective to check locally first, so if the CLAMS network doesn’t have the item, it’s time to look in the Commonwealth Catalog.
Powerful search
The Commonwealth Catalog searches all participating libraries in one easy step and allows you to sort your results by material type: books, audiobooks, DVD. Right now eBooks are not a part of the search, but we’re working on it. If you’re looking for eBooks please visit mass.gov/libraries.
Millions of items
The Commonwealth Catalog gives you access to millions of items from libraries that hold unique collections such as Boston Public Library and UMass Amherst and other academic, special and public libraries.
While service has been restored, not all libraries are currently participating and delivery may take longer than in the past. Once you request an item through the Commonwealth Catalog it may take up to two weeks for your local library to receive it. We’ll notify you so you can stop by your library and pick it up. You’ll also return the item to your local library.
Funding for the Commonwealth Catalog provided by the Massachusetts Board of Library Commissioners and the Institute of Museum and Library Services.
