You can read and write reviews about Cosi by clicking the buttons on the right of the page. Are you the owner of this business? Do you know you can upload a video of Cosi for free to help promote it? For easy to use driving directions to East Boston in Boston please click the "View Larger Map" link below and put in your address. Did you try to visit Cosi at East Boston but were unable? Please click the "SEND" button below to let us know. Please visit Cosi at East Boston in Boston. If you would prefer you can also call them at (617) 567-1066.