St. Clair County, Illinois, a core county of the St. Louis-St. Charles-Farmington, MO-IL market, holds $5.8B in deposits across 26 insured institutions and 67 branches. Regions Bank is the largest deposit holder at 14.6% share. The top three institutions hold 30.3% of deposits, which places the county in the fragmented band. Deposits have grown 27.4% since 2020 while the branch count fell by 13. It produces $12.7B of output, ranking #310 of the 1,523 counties within a CSA or MSA by economic output.
Deposit trend
Branches: 80 in 2020 to 67 in 2025. Institutions: 29 to 26. Top-three share: 31.9% to 30.3%.
Leading institutions by deposits
| Institution | Deposits | Share | 5‑yr |
|---|---|---|---|
| Regions Bank | $848M | 14.6% | +8% |
| Associated Bank, National Association | $469M | 8.1% | +56% |
| Carrollton Bank | $448M | 7.7% | +106% |
| Busey Bank | $437M | 7.5% | +66% |
| Bank of America, National Association | $422M | 7.2% | +104% |
| Citizens Community Bank | $418M | 7.2% | +14% |
| FCB Banks | $368M | 6.3% | +20% |
| Bank of Belleville | $352M | 6.0% | +61% |
| Bank of O'Fallon | $320M | 5.5% | +13% |
| First National Bank of Waterloo | $277M | 4.8% | +176% |
The 10 insured institutions with a branch presence in this county, as of June 30, 2025. Five-year change compares the same institution’s county deposits in 2020 and 2025. Institutions are tracked by FDIC certificate number, and where an institution acquired another bank, the acquired bank’s prior deposits are folded into the baseline so the change reflects the combined, continuing franchise rather than reading as new. Even so, a large gain can reflect acquisition rather than competitive growth; “no 2020 presence” means neither the institution nor a bank it later absorbed reported deposits in this county that year.
Part of the St. Louis-St. Charles-Farmington market
St. Clair County is one of 17 counties that make up the St. Louis-St. Charles-Farmington, MO-IL market, a Combined Statistical Area (ranked #27 of 293 U.S. markets by economic output). It produces 6.6% of the market’s output and holds 4.2% of its deposits.
| Measure | St. Clair County | Share of St. Louis-St. Charles-Farmington market |
|---|---|---|
| 2024 GDP | $12.7B | 6.6% |
| Deposits | $5.8B | 4.2% |
| Population | 250,708 | 8.6% |
View the full St. Louis-St. Charles-Farmington market profile →
Recruiting in St. Clair County
Deposits are spread across a competitive field of institutions, so the bankers worth recruiting are dispersed across more of them. Who holds the deposits, and how contested the market is, shapes both the runway for growth and the competition you would be recruiting against. We recruit commercial relationship managers, banking teams, and market leaders for banks building in markets like St. Clair County, on a retained basis.
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