 Most of Beloit's development is occurring on the east side, adjacent to Interstates 39/90 and Interstate 43, where the city annexed rural land for the extensive Beloit Gateway Industrial Park, as well as in the newly revitalized downtown located along the Rock River.As of the census of 2010, there were 36,966 people, 13,781 households, and 8,867 families residing in the city.The population density was .