Bank Branches › Banks › Old Second National Bank
Old Second National Bank
57 offices in 1 state as of June 30, 2026. $5.5 billion in deposits. Main office: 37 S River St, Aurora, IL. FDIC certificate 3603.
57
offices
1
states
−1
gone since 2025
+0
new since 2025
Where its offices are
Offices over time
Bank offices reporting on June 30Deposits booked at them (nominal dollars, own scale)
| Date | offices | Change | Deposits |
|---|---|---|---|
| Jun 30 1994 | 4 | $335M | |
| Jun 30 1995 | 4 | · | $372M |
| Jun 30 2000 | 11 | · | $625M |
| Jun 30 2005 | 15 | +3 | $1.3B |
| Jun 30 2010 | 27 | −8 | $2.2B |
| Jun 30 2015 | 25 | −2 | $1.7B |
| Jun 30 2020 | 29 | +1 | $2.5B |
| Jun 30 2025 | 56 | +5 | $4.9B |
| Jun 30 2026PEAK | 57 | +1 | $5.5B |
Open the full passbook — all 33 years ▾
| Date | offices | Change | Deposits |
|---|---|---|---|
| Jun 30 1994 | 4 | $335M | |
| Jun 30 1995 | 4 | · | $372M |
| Jun 30 1996 | 4 | · | $378M |
| Jun 30 1997 | 9 | +5 | $455M |
| Jun 30 1998 | 9 | · | $450M |
| Jun 30 1999 | 11 | +2 | $558M |
| Jun 30 2000 | 11 | · | $625M |
| Jun 30 2001 | 11 | · | $723M |
| Jun 30 2002 | 13 | +2 | $869M |
| Jun 30 2003 | 12 | −1 | $997M |
| Jun 30 2004 | 12 | · | $1.1B |
| Jun 30 2005 | 15 | +3 | $1.3B |
| Jun 30 2006 | 16 | +1 | $1.3B |
| Jun 30 2007 | 19 | +3 | $1.4B |
| Jun 30 2008 | 36 | +17 | $2.4B |
| Jun 30 2009 | 35 | −1 | $2.4B |
| Jun 30 2010 | 27 | −8 | $2.2B |
| Jun 30 2011 | 27 | · | $1.8B |
| Jun 30 2012 | 27 | · | $1.8B |
| Jun 30 2013 | 27 | · | $1.7B |
| Jun 30 2014 | 27 | · | $1.7B |
| Jun 30 2015 | 25 | −2 | $1.7B |
| Jun 30 2016 | 24 | −1 | $1.8B |
| Jun 30 2017 | 25 | +1 | $1.9B |
| Jun 30 2018 | 28 | +3 | $2.2B |
| Jun 30 2019 | 28 | · | $2.1B |
| Jun 30 2020 | 29 | +1 | $2.5B |
| Jun 30 2021 | 29 | · | $2.8B |
| Jun 30 2022 | 54 | +25 | $5.4B |
| Jun 30 2023 | 51 | −3 | $4.7B |
| Jun 30 2024 | 51 | · | $4.6B |
| Jun 30 2025 | 56 | +5 | $4.9B |
| Jun 30 2026PEAK | 57 | +1 | $5.5B |
Counted under FDIC certificate 3603. When one bank buys another, the bought bank's offices move onto the buyer's certificate, so a jump here is usually a merger, not a building spree. Its earlier names and the banks folded into it →
Offices with the most deposits booked
| Office | Deposits |
|---|---|
| Old Second National BankAurora, IL | $867M |
| Downtown Chicago BranchChicago, IL | $440M |
| Westmore BranchLombard, IL | $299M |
| Cass Avenue BranchDarien, IL | $247M |
| Oak Brook BranchOak Brook, IL | $241M |
| Evergreen Park BranchEvergreen Park, IL | $180M |
| Countryside BranchYorkville, IL | $168M |
| Oswego BranchOswego, IL | $158M |
| Elburn BranchElburn, IL | $142M |
| West Galena BranchAurora, IL | $123M |
By state
| State | Offices |
|---|---|
| Illinois | 57 |