Suffolk County, New York, a core county of the New York-Newark, NY-NJ-CT-PA market, holds $62.8B in deposits across 22 insured institutions and 305 branches. JPMorgan Chase Bank, National Association is the largest deposit holder at 26.7% share. The top three institutions hold 46.8% of deposits, which places the county in the moderately concentrated band. Deposits have fallen 0.6% since 2020 while the branch count fell by 58. It produces $108.2B of output, ranking #37 of the 1,523 counties within a CSA or MSA by economic output.
Deposit trend
Branches: 363 in 2020 to 305 in 2025. Institutions: 24 to 22. Top-three share: 46.0% to 46.8%.
Leading institutions by deposits
| Institution | Deposits | Share | 5‑yr |
|---|---|---|---|
| JPMorgan Chase Bank, National Association | $16.8B | 26.7% | +16% |
| Dime Community Bank | $6.3B | 10.1% | +56% |
| Capital One, National Association | $6.2B | 9.9% | -34% |
| Bank of America, National Association | $5.9B | 9.4% | +16% |
| TD Bank, National Association | $5.9B | 9.4% | +19% |
| Citibank, National Association | $4.6B | 7.2% | -2% |
| Flagstar Bank, National Association | $3.5B | 5.6% | -8% |
| Manufacturers and Traders Trust Company | $3.3B | 5.3% | -26% |
| BankUnited, National Association | $2.1B | 3.4% | -7% |
| Webster Bank, National Association | $2.0B | 3.1% | -4% |
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 New York-Newark market
Suffolk County is one of 30 counties that make up the New York-Newark, NY-NJ-CT-PA market, a Combined Statistical Area (ranked #1 of 293 U.S. markets by economic output). It produces 5.1% of the market’s output and holds 2.2% of its deposits.
| Measure | Suffolk County | Share of New York-Newark market |
|---|---|---|
| 2024 GDP | $108.2B | 5.1% |
| Deposits | $62.8B | 2.2% |
| Population | 1,546,090 | 6.9% |
View the full New York-Newark market profile →
Recruiting in Suffolk 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 Suffolk County, on a retained basis.
Start a confidential conversation