St John's Church at Diocesan Center
Philadelphia, Pennsylvania
Last updated May 2026

~4,407
estimated members
Based on ARDA 2020 data, this is likely one of 59 Catholic congregations in Montgomery County, PA, with an average size of approximately 4,407 members. Catholic accounts for 56% of the county's 627 congregations.
Source: ARDA 2020 Religious Congregations & Membership Study
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