Lake County is a county located in the U.S. state of Indiana. In 2020, its population was 498,700, making it Indiana's second-most populous county. The county seat is Crown Point. The county is part of Northwest Indiana and the Chicago metropolitan area, and contains a mix of urban, suburban and rural areas. It is bordered on the north by Lake Michigan and contains a portion of the Indiana Dunes. It includes Marktown, Clayton Mark's planned worker community in East Chicago.

Crown Point is a city in and the county seat of Lake County, Indiana, United States. The population was 33,899 at the 2020 census. The city was incorporated in 1868. On October 31, 1834, Solon Robinson and his family became the first settlers to an area that later became Crown Point. Due to its location, Crown Point is known as the "Hub of Lake County".