Grundy County, Illinois, a county in the Chicago-Naperville, IL-IN-WI market, holds $1.7B in deposits across 13 insured institutions and 20 branches. Old National Bank is the largest deposit holder at 20.6% share. The top three institutions hold 52.1% of deposits, which places the county in the moderately concentrated band. Deposits have grown 25.1% since 2020 while the branch count fell by 2. It produces $4.7B of output, ranking #620 of the 1,523 counties within a CSA or MSA by economic output.
Deposit trend
Branches: 22 in 2020 to 20 in 2025. Institutions: 13 to 13. Top-three share: 61.2% to 52.1%.
Leading institutions by deposits
| Institution | Deposits | Share | 5‑yr |
|---|---|---|---|
| Old National Bank | $354M | 20.6% | -28% |
| Grundy Bank | $334M | 19.5% | +79% |
| Busey Bank | $205M | 12.0% | +138% |
| BMO Bank National Association | $192M | 11.2% | +20% |
| CIBC Bank USA | $180M | 10.5% | +57% |
| JPMorgan Chase Bank, National Association | $129M | 7.5% | +80% |
| Midland States Bank | $104M | 6.1% | +24% |
| OSB Community Bank | $59M | 3.4% | +32% |
| First Secure Community Bank | $37M | 2.1% | +3% |
| Heartland Bank and Trust Company | $35M | 2.0% | +22% |
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 Chicago-Naperville market
Grundy County is one of 19 counties that make up the Chicago-Naperville, IL-IN-WI market, a Combined Statistical Area (ranked #5 of 293 U.S. markets by economic output). It produces 0.6% of the market’s output and holds 0.3% of its deposits.
| Measure | Grundy County | Share of Chicago-Naperville market |
|---|---|---|
| 2024 GDP | $4.7B | 0.6% |
| Deposits | $1.7B | 0.3% |
| Population | 54,052 | 0.5% |
View the full Chicago-Naperville market profile →
Recruiting in Grundy County
Deposits are split among a moderate 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 Grundy County, on a retained basis.
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