Rock County Government    Rock County Development    Rock County Planning    City of Janesville    Forward Janesville    Avalon (unincorporated)    Lima Center (unincorporated)    City of Milton    Milton Area Chamber of Commerce    City of Edgerton    Edgerton Chamber of Commerce    Village of Orfordville    Hanover (incorporated) WSOR serves Rock County directly from its Janesville, WI terminal. The rail line enters Rock County from four directions. From the north, the line comes from Madison. From the northeast, the line comes from Waukesha. From the southeast, it comes from Chicago. From the west, the line comes in from Monroe. Rock County is located in extreme southern Wisconsin, just north of the Illinois border.