Trinitarian Congregational Church
Boston, Massachusetts
Last updated May 2026
~373
estimated members
Based on ARDA 2020 data, this is likely one of 76 Non-Denominational congregations in Middlesex County, MA, with an average size of approximately 373 members. Non-Denominational accounts for 3% of the county's 958 congregations.
Source: ARDA 2020 Religious Congregations & Membership Study
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