Old National Bank. Share: Financial Institutions Visit Website 3052 Cahill Main Fitchburg, WI 53711 (608) 270-4080 LinkedIn Facebook Hours: M-F: 9:00am-5:00pmSa-Su: Closed About Map About Old National Bank is dedicated to providing you with additional account choices, expanded convenience, and greater control in how you manage your money. What's Nearby? Distance: 5 10 15 20 25 50 mi.