County banking markets / CT / 09180
Southeastern ConnecticutConnecticut
FIPS 09180. Branch offices reported to the FDIC Summary of Deposits, June 30 of each survey year, 2023–2025. One of 9 counties in Connecticut’s 2025 survey.
Concentration, 2023–2025
Branch-count HHI squares each institution’s share of the county’s branch offices; deposit HHI squares its share of county deposits. The bands are the 2010 Horizontal Merger Guidelines classification, the dashed line the 1,800 level above which the Federal Reserve reviews a merger centrally. In 2025 this market is unconcentrated on branches (1,113) and unconcentrated on deposits (1,199).
Source: FDIC Summary of Deposits | DOJ & FTC, Horizontal Merger Guidelines (2010), section 5.3 | Federal Reserve, Competitive Effects of Mergers and Acquisitions FAQs Both indices computed from the SOD branch rows for this county, June 30 of each survey year. Neither is the Fed's screen HHI: no thrift weighting, no exclusion of specialty and internet banks, no central-booking adjustment. Methodology
Branches and institutions
53 branch offices and 11 institutions in 2023; 71 and 14 in 2025. Deposits booked in the county went from $4.75B to $6.53B, nominal.
Source: FDIC Summary of Deposits FDIC Summary of Deposits, June 30 of each survey year, 2023-2025. Methodology
Who holds the deposits, 2025
Every institution with a branch in the county, ranked by deposits booked here. Both shares are shown because they are the two indices above: squaring and summing the deposit column gives the deposit HHI, the branch column the branch-count HHI.
| # | Institution | Deposits | Deposit share | Branches | Branch share |
|---|---|---|---|---|---|
| 1 | Chelsea Groton Bank cert 18238 | $1.18B | 18.11% | 14 | 19.72% |
| 2 | Liberty Bank cert 17943 | $969.4M | 14.84% | 9 | 12.68% |
| 3 | Bank of America, National Association cert 3510 | $840.4M | 12.87% | 5 | 7.04% |
| 4 | Citizens Bank, National Association cert 57957 | $810.3M | 12.41% | 6 | 8.45% |
| 5 | Dime Bank cert 18200 | $776.9M | 11.89% | 10 | 14.08% |
| 6 | Manufacturers and Traders Trust Company cert 588 | $700.6M | 10.73% | 7 | 9.86% |
| 7 | Berkshire Bank cert 23621 | $461.3M | 7.06% | 6 | 8.45% |
| 8 | Eastern Connecticut Savings Bank cert 28167 | $183.4M | 2.81% | 4 | 5.63% |
| 9 | Jewett City Savings Bank cert 18237 | $168.8M | 2.58% | 3 | 4.23% |
| 10 | TD Bank, National Association cert 18409 | $112.6M | 1.72% | 1 | 1.41% |
| 11 | Centreville Bank cert 17764 | $112.4M | 1.72% | 3 | 4.23% |
| 12 | The Washington Trust Company, of Westerly cert 23623 | $101.1M | 1.55% | 1 | 1.41% |
| 13 | KeyBank National Association cert 17534 | $97.8M | 1.50% | 1 | 1.41% |
| 14 | JPMorgan Chase Bank, National Association cert 628 | $14.1M | 0.22% | 1 | 1.41% |
Source: FDIC Summary of Deposits June 30, 2025. Branch rows grouped by FDIC certificate; names as reported to the survey. Deposit share is n/a where the county's total SOD deposits are zero. Methodology
Back to county banking markets, up to Connecticut, or read the methodology for the two HHI constructions and what they cannot tell you.