Located on the border of Illinois and Wisconsin along the scenic riverfront of the Rock River and Turtle Creek, the city of South Beloit is easily accessible off Interstate I-90, I-39, and I-43. Chicago, Milwaukee, and Madison are all within 90 miles. The location, reasonable housing costs, and friendly residents make South Beloit a great place to live, work, learn, and play. Manufacturing and retail businesses realize the great value and are "growing with small town values."
What is now South Beloit was previously full of natural resources such as copper, lead, and bog iron. Buff and blue limestones were plentiful everywhere in Winnebago County, with limestone forming the banks of the Rock River and Turtle Creek. The buff limestone gave the first settlers material for their houses and public buildings, some of which can still be seen in Rockford, Rockton, Beloit and South Beloit. The older homes in South Beloit had 18–20-inch-thick basement walls of this limestone. The South Beloit area has a thick deposit of sand, and industries were built here because of its unusually fine quality. A fine quality of clay was also found in the state line area. Two of the beautiful lakes, Lake Victoria and Pearl Lake, were originally gravel quarries.