Resident Population in St. Lawrence County, NY was 106.19800 Thous. of Persons in January of 2024, according to the United States Federal Reserve. Historically, Resident Population in St. Lawrence County, NY reached a record high of 117.30000 in January of 1976 and a record low of 106.19800 in January of 2024. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in St. Lawrence County, NY - last updated from the United States Federal Reserve on April of 2026.