Munster is an upper middle class town located in the North Township, Lake County, in Northwest Indiana in the United States. This bedroom community lies in the Chicago metropolitan area, approximately 30 miles (48 km) southeast of the Chicago Loop, and is surrounded by Hammond to the north, Highland to the east, Dyer and Schererville to the south, and Lansing and Lynwood directly west of the Illinois border. The 2010 U.S. Census counted the town's population at 23,603.
Munster is located at 41°33′5″N 87°30′5″W / 41.55139°N 87.50139°W / 41.55139; -87.50139 (41.551457, -87.501431), at a point on an ancient shoreline of Lake Michigan (known as the Calumet Shoreline) which is today Ridge Road. This ridge runs east and west through the north part of town, hence the town's nickname "Town on the Ridge". The town's boundaries contain three small lakes, one of which, located within Centennial Park, is marshy and undeveloped. The town is bordered on the north by the Little Calumet River, a shallow river surrounded by a thin strip of wooded area; and on the west by the Illinois state line.
According to the United States Census Bureau, the town has a total area of 7.6 square miles (19.7 km²), of which, 7.5 square miles (19.5 km²) of it is land and 0.1 square miles (0.1 km²) of it (0.66%) is water.