Resident Population in St. James Parish, LA was 19.11000 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in St. James Parish, LA reached a record high of 22.05100 in January of 2010 and a record low of 19.10000 in January of 1971. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in St. James Parish, LA - last updated from the United States Federal Reserve on April of 2026.