St. John Catholic Church
San Francisco, California
Last updated May 2026

~6,864
estimated members
Based on ARDA 2020 data, this is likely one of 47 Catholic congregations in Alameda County, CA, with an average size of approximately 6,864 members. Catholic accounts for 47% of the county's 1,085 congregations.
Source: ARDA 2020 Religious Congregations & Membership Study
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