Old Second National Bank
Aurora, IL · National commercial bank
Sonar Score
Strong
out of 100 · from public FDIC data
Reported June 30, 2026. The Sonar Score is an informational signal from public FDIC data — not a rating or financial advice.
Key figures
- Total assets
- $6.9B
- Total deposits
- $5.5B
- Branches
- 57
- Return on assets
- 1.69%
- Return on equity
- 12.59%
- Charter type
- National commercial bank
- Established
- 1887
- FDIC cert #
- 3603
How the 91 breaks down
Well-capitalized by regulatory thresholds.
Strong returns on its asset base.
Efficient use of shareholder capital.
Mid-size institution.
Your deposits at Old Second National Bank
Old Second National Bank is an FDIC-insured institution (Cert #3603). Deposits are insured up to $250,000 per depositor, per ownership category, by the full faith and credit of the US government. Learn how to maximize your coverage →
50 branch locations
9443 S Ashland Ave
Chicago, IL 60620
20201 S La Grange Rd
Frankfort, IL 60423
701 Westmore Meyers Rd
Lombard, IL 60148
200 John St
North Aurora, IL 60542
2800 Finley Rd
Downers Grove, IL 60515
8001 Cass Ave
Darien, IL 60561
355 W Army Trail Rd
Bloomingdale, IL 60108
1350 N Farnsworth Ave
Aurora, IL 60505
1991 W Wilson St
Batavia, IL 60510
1200 Douglas Rd
Oswego, IL 60543
26 W Countryside Pkwy
Yorkville, IL 60560
40w 422 Il-64
Wasco, IL 60183
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