Suffolk County, Massachusetts, a core county of the Boston-Worcester-Providence, MA-RI-NH market, holds $350.8B in deposits across 39 insured institutions and 212 branches. State Street Bank and Trust Company is the largest deposit holder at 59.3% share. The top three institutions hold 88.2% of deposits, which places the county in the concentrated band. Deposits have grown 27.7% since 2020 while the branch count fell by 37. It produces $153.1B of output, ranking #18 of the 1,523 counties within a CSA or MSA 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: 249 in 2020 to 212 in 2025. Institutions: 43 to 39. Top-three share: 83.0% to 88.2%.
Leading institutions by deposits
| Institution | Deposits | Share | 5‑yr |
|---|---|---|---|
| State Street Bank and Trust Company | $207.8B | 59.3% | +53% |
| Bank of America | $63.0B | 18.0% | +5% |
| Citizens Bank | $38.7B | 11.0% | +22% |
| Santander Bank | $20.5B | 5.8% | +55% |
| Eastern Bank | $7.8B | 2.2% | +111% |
| TD Bank | $2.7B | 0.8% | -37% |
| Rockland Trust Company | $2.2B | 0.6% | +111% |
| Brookline Bank | $1.2B | 0.3% | +48% |
| Berkshire Bank | $1.2B | 0.3% | +128% |
| JPMorgan Chase Bank | $1.2B | 0.3% | -88% |
The 10 largest of 39 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 organic growth; “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 Boston-Worcester-Providence market
Suffolk County is one of 18 counties that make up the Boston-Worcester-Providence, MA-RI-NH market, a Combined Statistical Area (ranked #6 of 293 U.S. markets by economic output). It produces 21.1% of the market’s output and holds 53.4% of its deposits.
| Measure | Suffolk County | Share of parent market |
|---|---|---|
| 2024 GDP | $153.1B | 21.1% |
| Deposits | $350.8B | 53.4% |
| Population | 791,891 | 9.3% |
View the full Boston-Worcester-Providence market profile →
Recruiting in Suffolk 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 Suffolk County, on a retained basis.
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