FDIC-insured bank
Bank of O'Fallon — O'Fallon, IL
Bank headquartered in O'Fallon, Illinois, part of SECURITY FIRST BANCSHARES INC.
Source: FDIC BankFind Suite, data as of June 30, 2026, fetched September 5, 2026
Headquarters and contact
| Address | 901 S Lincoln Ave O'Fallon, IL 62269 |
| County | St. Clair |
| Metro area | St. Louis, MO-IL |
| Website | www.bankofallon.com |
| Phone | not published in FDIC data, see the bank's website |
FDIC record
| FDIC Certificate | 18171 |
| Federal Reserve RSSD ID | 410748 |
| Status | Active |
| Charter class | NM (STATE) |
| Holding company | SECURITY FIRST BANCSHARES INC |
| Domestic offices | 2 |
| Financials as of | June 30, 2026 |
How to find your Bank of O'Fallon routing number
FDIC does not publish ABA routing numbers, and many banks use different routing numbers by state or by account type. The reliable places to find yours: the bottom left of a check from this bank, the "account details" screen in its online banking, or its official website at www.bankofallon.com.
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Offices nearest to headquarters
| Bank Of O'Fallon main office O'Fallon, IL |
901 S Lincoln Ave, 62269 |
| Drive-In Facility Branch O'Fallon, IL |
901 S Lincoln Ave, 62269 |
Where Bank of O'Fallon has offices
Cities with the most Bank of O'Fallon offices
Largest banks headquartered elsewhere in Illinois
| BMO Bank National Association Chicago | $254.97 billion |
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| Lake Forest Bank & Trust Company, National Association Lake Forest | $9.25 billion |
| First Mid Bank & Trust, National Association Mattoon | $9.14 billion |
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