St. Mary Catholic Church
Louisville/Jefferson County, Indiana
Last updated May 2026

~809
estimated members
Based on ARDA 2020 data, this is likely one of 4 Catholic congregations in Harrison County, IN, with an average size of approximately 809 members. Catholic accounts for 26% of the county's 79 congregations.
Source: ARDA 2020 Religious Congregations & Membership Study
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