Old Second National Bank Locations and Advisors in Illinois
- Aurora
- Bartlett
- Batavia
- Bensenville
- Bloomingdale
- Bolingbrook
- Burlington
- Carol Stream
- Chicago
- Chicago Heights
- Darien
- Downers Grove
- Elburn
- Elgin
- Flossmoor
- Frankfort
- Glendale Heights
- Joliet
- Lombard
- Montgomery
- Naperville
- North Aurora
- Oakbrook Terrace
- Oswego
- Ottawa
- Palos Heights
- Plano
- Romeoville
- South Elgin
- South Holland
- St Charles
- Sugar Grove
- Sycamore
- Villa Park
- Warrenville
- Wasco
- Wheaton
- Yorkville