Resident Population in St. Landry Parish, LA was 80.86900 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in St. Landry Parish, LA reached a record high of 92.30300 in January of 2009 and a record low of 78.70000 in January of 1974. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in St. Landry Parish, LA - last updated from the United States Federal Reserve on April of 2026.