Southern Wis Regional Air 4004 S Oakhill Ave Janesville, WI 53546 Phone : (608) 757-5768 Business Category Government Offices-County Airports Legislative Bodies Rock County Of--administrative Offices Of Rock County, Public Works Department, Airport Division Janesville, WI 53545 Phone : (608) 757-5768 Business Category Government Offices-County Government Offices & Public Schools Rock County Of--public Works Department, Airport Division 4004 S Oakhill Ave Janesville, WI 53546 Phone : (608) 757-5768 Business Category Government Offices-County Government Offices & Public Schools