Monroe County, Illinois, a core county of the St. Louis-St. Charles-Farmington, MO-IL market, holds $1.2B in deposits across 10 insured institutions and 20 branches. First National Bank of Waterloo is the largest deposit holder at 31.4% share. The top three banks hold 63% of deposits, which places the county in the Concentrated band. Deposits have grown 17.3% since 2020. It produces $1.0B of output, ranking #1,184 of the 1,523 ranked counties by economic output.
Ranks show where the county stands among the 1,523 ranked counties (those within a Combined or Metropolitan Statistical Area that have a branch). They describe relative position, not a rating of market quality or suitability.
Deposit trend
Branches: 20 in 2020 to 20 in 2025. Institutions: 11 to 10. Top-three share: 60% to 63%.
Institutions by deposits
| Institution | Deposits | Share | 5‑yr deposits |
|---|---|---|---|
| First National Bank of Waterloo | $372M | 31.4% | +14% |
| State Bank | $214M | 18.1% | +26% |
| Regions Bank | $156M | 13.2% | +42% |
| Dieterich Bank | $93M | 7.9% | no 2020 presence |
| Midland States Bank | $91M | 7.7% | +5% |
| FCB Banks | $87M | 7.4% | +88% |
| Associated Bank | $79M | 6.6% | +88% |
| Commerce Bank | $52M | 4.4% | +12% |
| Bank of Belleville | $26M | 2.2% | no 2020 presence |
| The Central Trust Bank | $13M | 1.1% | no 2020 presence |
The 10 insured institutions with a branch presence in this county, per the FDIC Summary of Deposits, 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. “No 2020 presence” means neither the institution nor a bank it later absorbed reported deposits in this county that year. Deposit figures are nominal and are not adjusted for inflation.
Part of the St. Louis-St. Charles-Farmington market
Monroe 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 0.5% of the market’s output and holds 0.9% of its deposits.
| Measure | Monroe County | Share of parent market |
|---|---|---|
| 2024 GDP | $1.0B | 0.5% |
| Deposits | $1.2B | 0.9% |
| Population | 34,840 | 1.2% |
View the full St. Louis-St. Charles-Farmington market profile →
Recruiting in Monroe County
Deposits are held closely by the largest banks, which often means the bankers worth recruiting are inside a small number of institutions. 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 Monroe County.
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