Resident Population in Lake County, IN was 500.59800 Thous. of Persons in January of 2023, according to the United States Federal Reserve. Historically, Resident Population in Lake County, IN reached a record high of 551.10000 in January of 1971 and a record low of 471.84200 in January of 1987. Trading Economics provides the current actual value, an historical data chart and related indicators for Resident Population in Lake County, IN - last updated from the United States Federal Reserve on May of 2024.