South Beloit sits on the WI/IL state line, and we work closely with economic development community partners in Rock County in Wisconsin and Winnebago County in Illinois. Our geographical location on the Illinois-Wisconsin border, midway between Lake Michigan and the Mississippi River, puts us in the center of the U.S.A.’s biggest market-the Midwest. Speedy access to these markets is provided by the area’s diversified transportation systems. Interstate Highways 39, 90, and 43 link the area with other Wisconsin and Illinois communities, as well as the rest of the nation.