Resident Population in St. Clair County, AL was 96.92700 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in St. Clair County, AL reached a record high of 96.92700 in January of 2024 and a record low of 27.95600 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in St. Clair County, AL - last updated from the United States Federal Reserve on April of 2026.