Old Second National Bank
Headquartered in Aurora, IL. Part of Old Second Bancorp, Inc. FDIC certificate #3603 · Federal Reserve RSSD 936136.
Total assets
$6.8B
Deposits
$5.6B
Q1 2026
Active branches
57
Closings since Jan 2020
23
2 openings since Jan 2020
Financial snapshot — Q1 2026
All quarters →Net income (quarter)
$28M
Return on assets
1.61%
Return on equity
12.05%
Noncurrent loan rate
1.45%
Deposits by year (Summary of Deposits)
22019
22020
32021
52022
52023
52024
52025
Values in $ billions, June 30 of each year.
Closings by year
32021
172022
12023
12025
12026
Openings by year
12021
12023
Other network changes since 2020
- 44 branches acquired through purchases or mergers
Branches by state
Recent closings
- Old Second National Bank — Hinsdale, ILbank exits city1 GRANT SQ · closed May 30, 2026
- 8301 CASS AVE · closed July 5, 2025
- Old Second National Bank — Kaneville, ILbank exits city2S101 HARTER ROAD · closed February 1, 2023
- CROSS STREET AT ILLINOIS ROUTE 47 · closed September 30, 2022
- 2000 WEST GALENA BLVD · closed August 6, 2022
- 901 ESSINGTON ROAD · closed July 1, 2022
- Old Second National Bank — Saint Charles, ILbank exits city801 S. KIRK ROAD · closed April 22, 2022
- 101 N LAKE ST · closed April 22, 2022
- 4080 FOX VALLEY CENTER DRIVE · closed April 22, 2022
- Old Second National Bank — Lisle, ILbank exits city3101 OGDEN ROAD · closed April 22, 2022
- 555 REDWOOD DRIVE · closed April 22, 2022
- 2830 ROUTE 34 · closed April 15, 2022
- 1296 E CHICAGO AVE · closed April 15, 2022
- Old Second National Bank — Westmont, ILbank exits city6400 S CASS AVE · closed April 15, 2022
- 1005 75TH ST · closed April 15, 2022
- 1311 BUTTERFIELD RD · closed April 15, 2022
- 5330 SOUTH MAIN STREET · closed April 15, 2022
- 895 EAST GENEVA ROAD · closed April 15, 2022
- 1004 104TH STREET · closed April 15, 2022
- 221 S WEST ST · closed April 1, 2022
- 2100 FINLEY ROAD · closed December 2, 2021
- 2400 S FINLEY RD · closed December 2, 2021
- 2100 FINLEY ROAD · closed December 1, 2021
All figures transcribed from FDIC BankFind Suite records: structure-change history, quarterly financial reports and the annual Summary of Deposits · bank site: www.oldsecond.com.