Contact Us

Commonwealth Automobile Reinsurers is conveniently located on the 4th floor of 101 Arch Street in Boston's historic Downtown Crossing district. We are easily accessible from Route 93, the Southeast Expressway, and the Massachusetts Turnpike (I-90). MBTA's Downtown Crossing stop on both the Orange Line and the Red Line is located beneath our building with direct access to the building's lobby area. We are also within walking distance of the Commuter Rail at South Station.

To give feedback relative to our website, or to contact us with any questions or concerns, please email Data Operations or telephone 617-338-4000.

101 Arch Street, Suite 400
Boston, MA 02110
Phone and Fax Numbers
Phone:  617-338-4000
Fax:  617-338-5422
Office Hours
Commonwealth Automobile Reinsurers is open Monday through Friday, 8:30 a.m. to 4:30 p.m. 
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