Suffolk County, Massachusetts, a core county of the Boston-Worcester-Providence, MA-RI-NH market, holds $381.2B in deposits across 36 insured institutions and 199 branches. State Street Bank and Trust Company is the largest deposit holder at 63.5% share. The top three banks hold 90% of deposits, which places the county in the Concentrated band. Deposits have grown 15.3% since 2021 while the branch count fell by 15.3%. It produced $153.1B of real gross domestic product in 2024, ranking #18 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: 235 in 2021 to 199 in 2026. Institutions: 43 to 36. Top-three share: 83% to 90%.
Institutions by deposits
The 36 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 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 54.4% of its deposits.
| Measure | Suffolk County | Share of parent market |
|---|---|---|
| 2024 GDP | $153.1B | 21.1% |
| Deposits | $381.2B | 54.4% |
| 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.
See how we help banks recruit commercial banking talent