Williamson County, Illinois, a core county of the Carbondale-Marion-Herrin, IL market, holds $1.9B in deposits across 14 insured institutions and 41 branches. Banterra Bank is the largest deposit holder at 25.8% share. The top three banks hold 60% of deposits, which places the county in the Concentrated band. Deposits have grown 21.2% since 2021 while the branch count fell by 2.4%. It produced $3.2B of real gross domestic product in 2024, ranking #746 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: 42 in 2021 to 41 in 2026. Institutions: 15 to 14. Top-three share: 58% to 60%.
Institutions by deposits
| Institution | Deposits | Share | 5‑yr deposits |
|---|---|---|---|
| Banterra Bank | $491M | 25.8% | +49% |
| First Southern Bank | $330M | 17.3% | +6% |
| The Bank of Herrin | $327M | 17.2% | +18% |
| Farmers State Bank of Alto Pass, Ill. | $130M | 6.8% | +24% |
| Peoples National Bank | $116M | 6.1% | +43% |
| U.S. Bank | $111M | 5.8% | +29% |
| Fifth Third Bank | $94M | 4.9% | +33% |
| SouthernTrust Bank | $76M | 4.0% | +24% |
| First Mid Bank & Trust | $70M | 3.7% | -5% |
| Regions Bank | $66M | 3.5% | -2% |
| Legence Bank | $59M | 3.1% | -6% |
| Southern Illinois Bank | $26M | 1.4% | -33% |
| Woodforest National Bank | $5M | 0.3% | +14% |
| Murphy-Wall State Bank and Trust Company | $3M | 0.1% | -34% |
The 14 insured institutions with a branch presence in this county, per the FDIC Summary of Deposits, June 30, 2026. Five-year change compares the same institution’s county deposits in 2021 and 2026. 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 2021 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 Carbondale-Marion-Herrin market
Williamson County is one of 2 counties that make up the Carbondale-Marion-Herrin, IL market, a Combined Statistical Area (ranked #260 of 293 U.S. markets by economic output). It produces 54.8% of the market’s output and holds 61.4% of its deposits.
| Measure | Williamson County | Share of parent market |
|---|---|---|
| 2024 GDP | $3.2B | 54.8% |
| Deposits | $1.9B | 61.4% |
| Population | 67,225 | 56.1% |
View the full Carbondale-Marion-Herrin market profile →
Recruiting in Williamson 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 Williamson County.
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