Never heard of Lake County.
Look at the WISH TV link. It list counties of Indiana.
Marion County is Indianapolis
Hammond, Gary, Munster, Crown Pointe, etc, etc
Lake County is a county located in the U.S. state of Indiana. In 2010, its population was 496,005,[1] making it Indiana’s second-most populous county. The county seat is Crown Point.[2] This county is part of Northwest Indiana and the Chicago metropolitan area. The county contains a mix of urban, suburban, and rural areas.
You can’t miss it, just drive up I-65 until in runs out and you’re there. s/