List of all Old Second National Bank branches by state:
Illinois
6400 West North Ave Br
9443 South Ashland Avenue Branch
Downtown Chicago Branch
Taylor Street Branch
Chicago Heights Branch
Sycamore Branch
Fox Valley Center Branch
Bensenville Branch
Lisle/Naperville Branch
Old Second National Bank
West Aurora-Redwood Drive Branch
Farnsworth Branch
Orchard Branch
Old Second Batavia Branch
Burlington Branch
Elburn Branch
Elgin-Route 20 Branch
Kaneville Branch
North Aurora Branch
St. Charles Branch
Sugar Grove Branch
Wasco Branch
Oswego Branch
Plano West Branch
Countryside Branch
Ottawa Branch
Frankfort Branch
Joliet Branch