Banks in St. Clair County, Illinois
68 active bank branches operated by 26 institutions, per FDIC records.
Active branches
68
Banks present
26
Deposits (2026)
$5.9B
Closings since 2020
17
4 openings
Largest banks by deposits in St. Clair County (2026)
| Bank | Deposits | Share | Branches |
|---|---|---|---|
| Regions Bank | $843M | 14.2% | 12 |
| Associated Bank | $498M | 8.4% | 3 |
| Busey Bank | $475M | 8% | 3 |
| Carrollton Bank | $459M | 7.7% | 1 |
| Citizens Community Bank | $446M | 7.5% | 4 |
| Bank of America | $413M | 6.9% | 2 |
| FCB Banks | $384M | 6.5% | 4 |
| Bank of Belleville | $346M | 5.8% | 1 |
| Bank of O'Fallon | $324M | 5.5% | 2 |
| First National Bank of Waterloo | $283M | 4.8% | 8 |
Deposit location reflects the office to which deposits are reported and may not represent the residence of depositors.
Cities and towns
Transcribed from FDIC BankFind Suite active-location records and the annual Summary of Deposits. County assignment follows the FDIC branch record.