St Mary of the Valley
Seattle, Washington
Last updated May 2026

~4,665
estimated members
Based on ARDA 2020 data, this is likely one of 17 Catholic congregations in Snohomish County, WA, with an average size of approximately 4,665 members. Catholic accounts for 22% of the county's 552 congregations.
Source: ARDA 2020 Religious Congregations & Membership Study
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