Archbishop O'Malley's mailing address is:

Most Rev. Sean O'Malley, OFM Cap., Archbishop of Boston
2101 Commonwealth Avenue 
Brighton, Massachusetts 02135.

The regional bishop of the West Region of the Archdiocese is Most Rev. Walter Edyvean. His address is:

Most Rev. Walter Edyvean
St. Patrick Parish
44 East Central Street
Natick, MA 01760