Resident Population in Lewis County, NY was 26.54800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Lewis County, NY reached a record high of 27.36400 in January of 1995 and a record low of 23.64400 in January of 1970. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Lewis County, NY - last updated from the United States Federal Reserve on May of 2024.