Murphysboro is a city in and the county seat of Jackson County, Illinois, United States. The population was 7,970 at the 2010 census. The city is part of the Metro Lakeland area. Murphysboro is located 5 miles (8.0km) southeast of Kinkaid Lake. According to the United States Census Bureau, the city has a total area of 4.8 square miles (12.5km²), of which, 4.8 square miles (12.5km²) of it is land and 0.21% is water.