Cook County, Illinois, a core county of the Chicago-Naperville, IL-IN-WI market, holds $441.9B in deposits across 95 insured institutions and 1131 branches. BMO Bank National Association is the largest deposit holder at 21.0% share. The top three institutions hold 51.1% of deposits, which places the county in the moderately concentrated band. Deposits have grown 16.4% since 2020 while the branch count fell by 162. It produces $432.6B of output, ranking #4 of the 1,523 counties within a CSA or MSA by economic output.
Deposit trend
Branches: 1293 in 2020 to 1131 in 2025. Institutions: 102 to 95. Top-three share: 51.9% to 51.1%.
Leading institutions by deposits
| Institution | Deposits | Share | 5‑yr |
|---|---|---|---|
| BMO Bank National Association | $92.9B | 21.0% | +33% |
| JPMorgan Chase Bank, National Association | $89.5B | 20.2% | +5% |
| CIBC Bank USA | $43.4B | 9.8% | +70% |
| Bank of America, National Association | $40.6B | 9.2% | -2% |
| The Northern Trust Company | $34.9B | 7.9% | +6% |
| Fifth Third Bank, National Association | $18.1B | 4.1% | -14% |
| PNC Bank, National Association | $10.5B | 2.4% | +22% |
| Citibank, National Association | $9.9B | 2.2% | -7% |
| U.S. Bank National Association | $9.7B | 2.2% | +12% |
| Wells Fargo Bank, National Association | $8.7B | 2.0% | +5% |
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
Cook 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 57.5% of the market’s output and holds 71.7% of its deposits.
| Measure | Cook County | Share of Chicago-Naperville market |
|---|---|---|
| 2024 GDP | $432.6B | 57.5% |
| Deposits | $441.9B | 71.7% |
| Population | 5,194,625 | 52.1% |
View the full Chicago-Naperville market profile →
Recruiting in Cook 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 Cook County, on a retained basis.
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