Old Second National Bank
Aurora, IL · National commercial bank
Sonar Score
Stable
out of 100 · from public FDIC data
Reported March 31, 2026. The Sonar Score is an informational signal from public FDIC data — not a rating or financial advice.
Key figures
- Total assets
- $6.8B
- Total deposits
- $5.6B
- Branches
- 58
- Return on assets
- 1.61%
- Return on equity
- 12.05%
- Charter type
- National commercial bank
- Established
- 1887
- FDIC cert #
- 3603
How the 72 breaks down
Capital ratio not reported.
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
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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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