Commonwealth Catalog

Searching Beyond C/W MARS
The Commonwealth Catalog
Online Catalog for the state of Massachusetts

Please search the C/W MARS online catalog first. If the material you want is not available in central and western Massachusetts, you can request it via the Commonwealth Catalog

What is the Commonwealth Catalog?

The Commonwealth Catalog (ComCat) allows library patrons to locate and request library materials from all across the state, and have them delivered directly to their home library. No need for mediated interlibrary loan. ComCat has a modern and easy-to-use interface, including book jacket images and improved search options. Users can easily select their preferred format for an item when multiple choices are available. Hardcover, paperback, large print, audiobooks, and DVDs will appear together in search results.